WebAssembly (Wasm, WA) is a web standard that defines a binary format and a corresponding assembly-like text format for executable code in Web pages. It is meant to enable executing code nearly as fast as running native machine code. It was envisioned to complement JavaScript to speed up performance-critical parts of web applications and later on to enable web development in languages other than JavaScript. WebAssembly does not attempt to replace JavaScript, but to complement it. It is developed at the World Wide Web Consortium (W3C) with engineers from Mozilla, Microsoft, Google and Apple. It is executed in a sandbox in the web browser after a formal verification step. Programs can be compiled from high-level languages into Wasm modules and loaded as libraries from within JavaScript applets.

Source: https://en.wikipedia.org/wiki/WebAssembly

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