The main characteristic of IIS is that it manages the hosting of websites. Apart from storing static web pages, the IIS system is able to manage services and web applications such as ASP.NET.  Another feature of IIS is its ability to act as an FTP server. Among the characteristics of IIS is the integration of the Windows Communication Foundation (WCF) framework that provides support for service-oriented applications. IIS can be extended to include the capability to host PHP sites and web applications built on other platforms.