OWIN defines a standard interface between .NET web servers and web applications. The goal of the OWIN interface is to decouple server and application, encourage the development of simple modules for .NET web development, and, by being an open standard, stimulate the open source ecosystem of .NET web development tools.

 OWIN定义了一个标准的接口来连接.NET web 服务器（如：IIS，，HttpListner等）与web应用（如：ASP.NET Web API、ASP.NET MVC等）。OWIN设计的目标是对web服务器和web应用进行解耦，鼓励针对.NET web应用进行模块化编程。OWIN正成为一个开放的标准、这将促进.NET web开发工具开源的生态系统形成。