WebAssembly
In plain terms
A binary format letting non-JS languages run fast in the browser.
Going deeper
WebAssembly (Wasm) runs compiled code from languages like C++, Rust, and Go at near-native speed in the browser, alongside JavaScript. It enables heavy computation on the web.
Under the hood
A portable compilation target; complements JS for CPU-intensive tasks and now runs server-side too.
Examples
Figma, browser games, video editing, Rust/C++ in browser, Wasm runtimes.
Think of it like...
Like letting a race car engine run inside a web page for the heavy lifting.