.wasm File — WebAssembly Binary

WebAssembly (Wasm) is a binary instruction format designed as a portable compilation target for high-level languages, enabling near-native performance execution in web browsers and other environments. WASM files contain compiled WebAssembly modules — compact binary code that can be loaded and executed by the WebAssembly virtual machine built into all modern browsers. WebAssembly is not written directly but is generated by compiling languages like C, C++, Rust, Go, AssemblyScript, and others using compilers like Emscripten or wasm-pack. WebAssembly provides predictable performance, sandboxed execution, and is designed to complement JavaScript — compute-intensive tasks run in Wasm while JavaScript handles DOM manipulation and high-level logic. Use cases include game engines (Unity, Unreal in browsers), image/video processing (Photoshop web, Figma), scientific computing, cryptography, and porting desktop applications to the web. Beyond browsers, the WebAssembly System Interface (WASI) enables Wasm modules to run outside browsers as portable, sandboxed executables, spawning an ecosystem for serverless computing, plugin systems, and edge computing.