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WebAssembly (abbreviated Wasm) is a binary instruction format for a stack-based virtual machine. Wasm is designed as a portable compilation target for programming languages, enabling deployment on the web for client and server applications.
WASI - WebAssembly System Interface, WASI is a modular system interface for WebAssembly.
A bare metal physical implementation of WebAssembly. That's right, a WebAssembly CPU.