WebAssembly (WASM) is a binary instruction format which has been built to compile high-level languages such as C, C++, Java, Python and Rust. It allows deployment on the web and server applications.
Users write the code in multiple languages to run it on the web. WebAssembly allows them to run the code on the web at a native speed.
Mozilla developers, the ones who created WASM, define it as the code that users can run in web browsers. It provides new features and major improvements in performance.
A limitation of JS is that it wasn’t built to be a compilation target. On the other hand, WebAssembly has been built as an efficient compilation target. It is ready to use, provides smaller payloads, rapid parsing, as well as consistency in performance.