-[WebAssembly (WASM)][wasm] is a binary format that is optimized for fast download and maximum execution speed in a WASM runtime. A WASM runtime is designed to run on a target architecture and execute WebAssemblies in a sandbox, isolated from the host computer, at near-native performance. By default, WebAssemblies can't access resources on the host outside of the sandbox unless it is explicitly allowed, and they can't communicate over sockets to access things environment variables or HTTP traffic. The [WebAssembly System Interface (WASI)][wasi] standard defines an API for WASM runtimes to provide access to WebAssemblies to the environment and resources outside the host using a capabilities model.
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