---
title: Introduction · WASI.dev
bookmark: https://wasi.dev/
author:
published:
created: 2026-10-05
description: The WebAssembly System Interface (WASI) is a group of standards-track API specifications for software compiled to the W3C WebAssembly (Wasm) standard. WASI is designed to provide a secure standard interface for applications that can be compiled to Wasm from any language, and that may run anywhere, from browsers to clouds to embedded devices.
tags:
  - dev
  - compsci
  - wasm
---
The **WebAssembly System Interface (WASI)** is a group of standards-track API specifications for software compiled to the **[W3C WebAssembly (Wasm) standard](https://www.w3.org/TR/wasm-core-2/)**. WASI is designed to provide a secure standard interface for applications that can be compiled to Wasm from any language, and that may run anywhere, from browsers to clouds to embedded devices.

By standardizing APIs for WebAssembly, WASI provides a way to compose software written in different languages without costly and clunky interface systems like HTTP-based microservices. We believe that every project with a plugin model should be using WASI, and that WASI is ideally suited for projects with SDs for multiple languages, e.g. client libraries.

see [WASM](WASM.md)