WebAssembly (Wasm) is a modern technology that allows web browsers to run high-performance code written in languages like C, C++, or Rust. Unlike traditional JavaScript, Wasm enables complex applications - such as games, video editors, or scientific tools - to run quickly and efficiently within the browser. This is achieved by compiling code into a low-level, binary format that browsers can execute at near-native speed, improving performance and expanding what’s possible on the web while maintaining security and portability.