Computer Science Concepts - Learn With Examples

Data Types Explained: Integers, Floats, Booleans and Why They Differ

Every beginner hits the same wall sooner or later. They add 0.1 and 0.2, get 0.30000000000000004, and decide the computer is broken. It is not broken. It is doing exactly…

How a Phone’s Contact Search Finds Matches as You Type

You type the letter “m” and Mom appears. You add an “a” and the list shrinks. By the third letter, the person you wanted is already on screen and you…

What Is a Port Number? Why 80, 443 and 22 Matter

Networking basics · TCP and UDP · Security An IP address gets data to the right computer. But that computer is running dozens of programs at once: a browser, a…

What Is DHCP? How Your Device Gets an IP Address Automatically

You walk into a café, tap the Wi-Fi name, and within a second the web works. Nobody typed an address, picked a gateway or told your phone where to find…

Heap vs Sorted Array for Priority Handling

Data structures · Priority queues · Performance An emergency room does not treat patients in the order they walk in. A nurse looks at each person and the sickest one…

LRU Cache: Build One With a Hash Map and a Linked List

Your phone keeps the apps you used recently and quietly drops the ones you have ignored. Your browser, your database and your CPU do the same thing with data. The…

Git and GitHub Explained for Beginners (With Real Examples)

Version control · Beginner guide · Hands-on If you have ever saved a file as report_final_v2_REAL_final.docx, you already understand why Git exists. It is the grown-up version of that habit:…

Ransomware: How It Works and How It Spreads

Learn With Examples It almost never starts with a hacker in a hoodie breaking down a digital door. It starts with one password, one unpatched server, or one convincing email…