How Databases Search a Billion Rows
Every database you use is built on B-trees. See how they minimize disk I/O to search billions of rows efficiently.
b-treedatabasedata structurepostgresqlmysql
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Blog
How Coding Agents Actually Work
How do tools like Claude Code, Cursor, and Devin actually write code? The ReAct loop, tool calling, and context management — animated.
coding agentshow coding agents workcursor agentclaude codecopilot agent
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How DNS Actually Works
Every step of a DNS query visualized — from your browser's cache to root servers and back, in under 7 minutes.
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Docker Isn't a VM. Here's What It Actually Is.
Docker containers are not virtual machines. See how namespaces, cgroups, and union filesystems create isolated Linux processes.
dockercontainersvirtual machineslinuxnamespaces
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How JavaScript's Event Loop Actually Works
How JavaScript runs 1000 async tasks on a single thread. The call stack, task queue, microtask queue, and Web APIs — visualized.
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Your Branch Is 41 Bytes (Git Internals Explained)
Git is a content-addressable object store, not a diff tracker. See how blobs, trees, and commits actually work under the hood.
gitgit internalshow git worksgit tutorialversion control
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What Actually Happens Inside a Hash Map
A deep dive into hash maps — from the core hash-to-index trick, through collisions and resizing, to how Python, Java, and Go implement them differently.
hash maphash tabledata structuresalgorithmscomputer science
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The Secret Compiler Inside Python
Python compiles to bytecode before interpreting it. See the hidden compiler, the dis module, and what actually runs when you hit Enter.
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You Don't Hate Recursion. You Were Taught It Wrong.
Recursion visualized from the ground up. Watch the call stack build, see Fibonacci branch into a tree, and understand why memoization changes everything.
recursionrecursive functioncall stackstack framesfibonacci
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How Transformers See Every Word at Once
Self-attention, query-key-value, feed-forward networks, and generation — the full transformer architecture, animated step by step.
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