[krapp]

Webassembly is a language-agnostic, non-proprietary bytecode, intended both to be used online and natively.

Like Flash, Silverlight and Java, it allows the embedding and running of binary applications in the browser (although currently this also requires a Javascript shim to allow access to the DOM.) Unlike those, however, Webassembly is not intended to be used only by a single language. You can compile C, C++, Rust, and many other languages to Webassembly and run them both in the browser and as native applications.