How UTF-8 and Unicode Work: Code Points, Bytes, and Why Length Is Three Numbers
A string that looks like one character can be one byte, two bytes, or several code points that a font draws as a single glyph. len in one l...
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How IEEE 754 Floating Point Works: Formats, Rounding, and Why 0.1 Is Not Exact
A statement like 0.1 + 0.2 == 0.3 fails in Python, JavaScript, Java, Go, and C for the same reason. None of those languages stored the deci...
Sarthak Bystander
6 Oct, 2026
How System Calls Work: User Mode, Kernel Mode, and Crossing the Boundary
A user program cannot talk to a disk controller, change another process's page tables, or bind a TCP port by executing ordinary instruct...
Sarthak Bystander
11 Sept, 2026
How Garbage Collection Works: Mark-and-Sweep, Generational Collectors, and Pause Times
Garbage collection is the runtime mechanism that finds heap objects a program can no longer reach and reclaims their memory. Manual allocato...
Sarthak Bystander
6 Sept, 2026
How TCP Works: Handshake, Reliability, and Congestion Control
HTTP can describe a request. DNS can find an address. Neither of those steps moves a single reliable byte across an unreliable network. That...
Sarthak Bystander
4 Sept, 2026
What Happens When You Type a URL? Step-by-Step Explained
You type a website address, press Enter, and a page appears. That moment feels instant, but it triggers a carefully coordinated sequence of ...
Sarthak Bystander
4 Sept, 2026
Processes vs Threads Explained: How Programs Run Concurrently
Every running program becomes a process . A process owns isolated virtual memory, open files, credentials, and at least one thread . A threa...
Sarthak Bystander
3 Sept, 2026
Processes vs Threads Explained: How Programs Run Concurrently
Introduction A process is a running program with its own memory. A thread is the scheduled unit of execution inside a process. This article ...
Sarthak Bystander
3 Sept, 2026
SQL vs NoSQL Explained: How Databases Differ
SQL vs NoSQL is one of the first architecture choices a developer makes. This guide explains how each model stores data, how queries work in...
Sarthak Bystander
2 Sept, 2026
How Caching Works: A Beginner Guide for Developers
Every time you open a website and it loads in a fraction of a second, caching is probably doing most of the work. Caching is one of the most...
Sarthak Bystander
1 Sept, 2026