WebAssembly or Wasm for brevity is a Web-optimized executable software format designed to give programmers the greatest possible flexibility. Wasm binary modules can be compiled once and then safely run anywhere alone or embedded in other applications. In practice Wasm needs at least three key components to keep that promise. Two of them already presented in this series are the WebAssembly System Interface WASI and Wasm Interface Types.

WASI gives Wasm modules standard language-independent ways to interact with any host environment in which they may land. The Interface Types instead are equally standardized definitions but for all kinds of software variables. By using them Wasm modules can pass complex data structures to each other without risking corrupting them even if they were written by independent programmers in very different source languages. The other main piece of this puzzle is called module linking. This is what allows distinct binary files to interact directly for example using each others functions as if they were both written as different sections of the same source code and then compiled together.

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