Internet Information Service (IIS) is a web server software package designed for Windows Server. It provides a graphical user interface (GUI) for managing websites and the associated users. It can be used in both standard HTML and dynamic web pages such as ASP.Net applications and PHP pages. The website options such as error pages, default pages, security settings, logging settings, and performance optimizations can be modified by the web administrators by using IIS Manager Tool. It is mainly used for hosting websites and other contents on the web. It includes all the necessary features to host a website and also supports extensions for adding extra functionality to the server.