What is WebAssembly?
WebAssembly is a portable binary instruction format for browsers and other runtimes. It does not simply replace JavaScript.
How it works and where it is used
1. How it works Compilers turn source code into Wasm modules. Runtimes validate and execute them in a sandbox; host interfaces define memory and external access. 2. Applications and examples Games, media processing, scientific workloads and ported code are uses. JavaScript often handles interface work alongside compute-heavy Wasm.
Limits and good practice
3. Limitations and security Wasm is not automatically faster: compilation, copying and API boundaries cost time. Sandboxing cannot fix all application bugs. 4. Practical considerations Profile before porting code, minimize host permissions, update dependencies and measure across devices and browsers.