A beginner's guide to adding a new WASI syscall in Wasmtime

WebAssembly (WASM) is a binary instruction format for a stack-based virtual machine. In familiar terms, WASM is used as a compilation target for various programming languages (C, C++, or Rust, for example), generating a compact binary with a known format. Despite the name, WebAssembly is not a technology that can be used only on the web.