The Ultimate Guide to Algorithms

Published: May 21, 2025

Written by: Lizzie Danielson

Summarize This Page

On This Page

An algorithm can be found in nearly every aspect of modern technology, silently shaping the way we interact with the internet. But what's an algorithm, and why does it play such an essential role in our daily lives? Whether you're Googling a restaurant review, unlocking your phone with facial recognition, or simply scrolling through social media, algorithms are working hard behind the scenes.

This guide will tell you everything you need to know about algorithms, their different types in computing, and how they affect the average internet user.

What's an algorithm?

At its simplest, an algorithm is a set of instructions designed to carry out a specific task or solve a problem. Think of it as a recipe for baking a cake or a map guiding you to a destination. Algorithms are the foundation for how computers perform calculations, process data, and deliver solutions.

Real-world examples of algorithms at work include:

When you search for something online, search algorithms sift through massive amounts of data to give you the most relevant results.
When Netflix recommends shows, an algorithm analyzes your viewing habits.
Even traffic light systems use algorithms to manage traffic flow efficiently.

While they may often operate behind the scenes, algorithms hold the key to streamlining tasks and improving decision-making.

The different types of algorithms in computing

Algorithms come in a variety of forms, each designed for specific applications. Here are some of the most common types you might encounter in the realm of computing:

Search algorithms

Search algorithms power tools like Google. They take your input (keywords or phrases) and use sophisticated computations to retrieve the most relevant data.

Enter "best pizza near me" into a search engine, and within milliseconds, the algorithm scans its database and delivers options ranked by relevance based on your location and preferences.

Sorting algorithms

These algorithms organize data, enabling efficient searches and analysis, whether it’s arranging files by date or sorting numbers in ascending order. The quick sort and merge sort are popular sorting techniques.

Every time you arrange photos by date on your smartphone, a sorting algorithm is at work.

Encryption algorithms

Encryption algorithms secure sensitive information by converting it into unreadable formats unless you have the proper "key" to decode it.

Online bank transactions or messages sent on WhatsApp are encrypted, ensuring that unauthorized users can't access private information.

Machine learning algorithms

These adapt and improve from data over time. Supervised learning algorithms train on labeled datasets to make predictions, while unsupervised algorithms find hidden patterns without labels.

Spotify's "Discover Weekly" playlist is powered by machine learning algorithms, which predict what music you'll love based on your listening habits.

Facial recognition algorithms

Facial recognition systems use algorithms to analyze features and map them to a photo database. Face ID on your iPhone employs these algorithms to unlock your phone securely.

Backtracking and dynamic programming algorithms

These are problem-solving algorithms that divide tasks into smaller, manageable components. Backtracking tries different solutions step by step, while dynamic programming optimizes by reusing solutions to subproblems.

Finding the shortest route on GPS apps like Google Maps often involves dynamic programming to calculate the fastest possible path. That’s only scratching the surface. Algorithms like greedy algorithms, randomized algorithms, and brute-force algorithms play integral roles in various industries.

The impact of algorithms on your online experience

Algorithms aren't just for computer scientists. They touch nearly every part of our daily lives. Here are a few areas where you’re likely using them without even realizing it:

Social media algorithms

Ever noticed that some posts on Instagram or TikTok seem to know exactly what you're interested in? Social media platforms use algorithms to determine what content appears on your feed. They analyze your interactions, such as likes, shares, comments, and views to prioritize what they think you'd enjoy most.

These algorithms intentionally keep you engaged, sometimes creating addictive experiences or skewing your view of the world by showing content that aligns with your preferences.

E-Commerce recommendations

Amazon and other online retailers use algorithms to generate personalized shopping recommendations. Once you're browsing a product, you’ll often see a "Customers who bought this also bought" section, courtesy of an algorithm designed to increase sales.

Video streaming platforms

Have you found yourself binge-watching shows on Netflix after clicking "Play Next"? Streaming services rely on sophisticated recommendation algorithms to keep you watching.

Online ads

The ads you see online aren’t random. Behind every pop-up or banner, algorithms are tracking your browsing habits and purchasing patterns to tailor advertisements. This has raised debates about privacy and how much data companies should collect.

Fitness apps

Workout recommendations and calorie-tracking tools employ algorithms to offer personalized health insights.

Why learning about algorithms matters

Understanding algorithms ensures you're better equipped to:

Be aware of their influence: Algorithms shape your online experiences. Recognizing how they work allows you to detect biases or understand their impact.
Leverage technology effectively: Knowing the basics of algorithms can help you make smarter tech-related decisions, whether in business or personal life.
Question transparency: Stay aware of the ethics behind algorithmic decisions, especially with AI and machine learning.

Algorithms might seem abstract, but they play a powerful role in both our personal and professional lives. Understanding how they work gives you the insight to navigate the digital world with confidence.

Additional Resources

Read more about What is Log Retention? Cybersecurity Guide
What is Log Retention? Cybersecurity Guide
Learn how log retention supports cybersecurity compliance and incident response. Essential strategies for storing and managing security logs effectively.
Read more about What is Email Spoofing? Signs and How to Stay Protected
What is Email Spoofing? Signs and How to Stay Protected
Learn what email spoofing is, how cybercriminals use it to deceive, and practical steps to identify and prevent falling victim to this common cyber threat.
Read more about What Is a Botnet? How to Protect Your Devices
What Is a Botnet? How to Protect Your Devices
Learn what botnets are, how they work, and how attackers use them. Discover how to protect your devices from infection with this expert guide.
Read more about What Is Remote Code Execution (RCE)? How to Prevent It
What Is Remote Code Execution (RCE)? How to Prevent It
Learn what remote code execution (RCE) is, how attackers exploit RCE vulnerabilities through injection, deserialization, and buffer overflow attacks, and the proven strategies you need to protect your systems.
Read more about Monitoring vs. Observability: Key Differences Explained
Monitoring vs. Observability: Key Differences Explained
Learn the difference between monitoring and observability in cybersecurity. Find beginner-friendly definitions, key differences, and real-world examples.
Read more about What is File Integrity Monitoring (FIM)?
What is File Integrity Monitoring (FIM)?
Protect your files with File Integrity Monitoring (FIM). Learn how it detects unauthorized changes, prevents security breaches, and strengthens your cybersecurity defenses.
Read more about What is doxware?
What is doxware?
Understand doxware, a dangerous type of malware. Learn how it threatens to release sensitive data unless a ransom is paid and ways to protect against it.
Read more about What Is Glitching in Cybersecurity
What Is Glitching in Cybersecurity
Learn how glitching attacks work in hardware hacking, their real-world examples, and defensive techniques to prevent security breaches
Read more about What are cookies on the internet? When to accept cookies?
What are cookies on the internet? When to accept cookies?
Cookies play a crucial role in enhancing your online experience, but what are cookies, and are there any known risks to accepting them? Learn more from Huntress

Protect What Matters

Secure endpoints, email, and employees with the power of our 24/7 SOC. Try Huntress for free and deploy in minutes to start fighting threats.

Try Huntress for Free

The Ultimate Guide to Algorithms

Published: May 21, 2025

Written by: Lizzie Danielson

Summarize This Page

On This Page

This guide will tell you everything you need to know about algorithms, their different types in computing, and how they affect the average internet user.

What's an algorithm?

Real-world examples of algorithms at work include:

When you search for something online, search algorithms sift through massive amounts of data to give you the most relevant results.
When Netflix recommends shows, an algorithm analyzes your viewing habits.
Even traffic light systems use algorithms to manage traffic flow efficiently.

While they may often operate behind the scenes, algorithms hold the key to streamlining tasks and improving decision-making.

The different types of algorithms in computing

Algorithms come in a variety of forms, each designed for specific applications. Here are some of the most common types you might encounter in the realm of computing:

Search algorithms

Search algorithms power tools like Google. They take your input (keywords or phrases) and use sophisticated computations to retrieve the most relevant data.

Enter "best pizza near me" into a search engine, and within milliseconds, the algorithm scans its database and delivers options ranked by relevance based on your location and preferences.

Sorting algorithms

Every time you arrange photos by date on your smartphone, a sorting algorithm is at work.

Encryption algorithms

Encryption algorithms secure sensitive information by converting it into unreadable formats unless you have the proper "key" to decode it.

Online bank transactions or messages sent on WhatsApp are encrypted, ensuring that unauthorized users can't access private information.

Machine learning algorithms

These adapt and improve from data over time. Supervised learning algorithms train on labeled datasets to make predictions, while unsupervised algorithms find hidden patterns without labels.

Spotify's "Discover Weekly" playlist is powered by machine learning algorithms, which predict what music you'll love based on your listening habits.

Facial recognition algorithms

Facial recognition systems use algorithms to analyze features and map them to a photo database. Face ID on your iPhone employs these algorithms to unlock your phone securely.

Backtracking and dynamic programming algorithms

The impact of algorithms on your online experience

Algorithms aren't just for computer scientists. They touch nearly every part of our daily lives. Here are a few areas where you’re likely using them without even realizing it:

Social media algorithms

These algorithms intentionally keep you engaged, sometimes creating addictive experiences or skewing your view of the world by showing content that aligns with your preferences.

E-Commerce recommendations

Video streaming platforms

Have you found yourself binge-watching shows on Netflix after clicking "Play Next"? Streaming services rely on sophisticated recommendation algorithms to keep you watching.

Online ads

Fitness apps

Workout recommendations and calorie-tracking tools employ algorithms to offer personalized health insights.

Why learning about algorithms matters

Understanding algorithms ensures you're better equipped to:

Be aware of their influence: Algorithms shape your online experiences. Recognizing how they work allows you to detect biases or understand their impact.
Leverage technology effectively: Knowing the basics of algorithms can help you make smarter tech-related decisions, whether in business or personal life.
Question transparency: Stay aware of the ethics behind algorithmic decisions, especially with AI and machine learning.

Additional Resources

Read more about What is Log Retention? Cybersecurity Guide
What is Log Retention? Cybersecurity Guide
Learn how log retention supports cybersecurity compliance and incident response. Essential strategies for storing and managing security logs effectively.
Read more about What is Email Spoofing? Signs and How to Stay Protected
What is Email Spoofing? Signs and How to Stay Protected
Learn what email spoofing is, how cybercriminals use it to deceive, and practical steps to identify and prevent falling victim to this common cyber threat.
Read more about What Is a Botnet? How to Protect Your Devices
What Is a Botnet? How to Protect Your Devices
Learn what botnets are, how they work, and how attackers use them. Discover how to protect your devices from infection with this expert guide.
Read more about What Is Remote Code Execution (RCE)? How to Prevent It
What Is Remote Code Execution (RCE)? How to Prevent It
Learn what remote code execution (RCE) is, how attackers exploit RCE vulnerabilities through injection, deserialization, and buffer overflow attacks, and the proven strategies you need to protect your systems.
Read more about Monitoring vs. Observability: Key Differences Explained
Monitoring vs. Observability: Key Differences Explained
Learn the difference between monitoring and observability in cybersecurity. Find beginner-friendly definitions, key differences, and real-world examples.
Read more about What is File Integrity Monitoring (FIM)?
What is File Integrity Monitoring (FIM)?
Protect your files with File Integrity Monitoring (FIM). Learn how it detects unauthorized changes, prevents security breaches, and strengthens your cybersecurity defenses.
Read more about What is doxware?
What is doxware?
Understand doxware, a dangerous type of malware. Learn how it threatens to release sensitive data unless a ransom is paid and ways to protect against it.
Read more about What Is Glitching in Cybersecurity
What Is Glitching in Cybersecurity
Learn how glitching attacks work in hardware hacking, their real-world examples, and defensive techniques to prevent security breaches
Read more about What are cookies on the internet? When to accept cookies?
What are cookies on the internet? When to accept cookies?
Cookies play a crucial role in enhancing your online experience, but what are cookies, and are there any known risks to accepting them? Learn more from Huntress

Protect What Matters

Secure endpoints, email, and employees with the power of our 24/7 SOC. Try Huntress for free and deploy in minutes to start fighting threats.

Try Huntress for Free