Internet Information Services (IIS) is created by Microsoft to provide Internet-based services to ASP.NET Web applications. It makes your system to work as a Web server and provides the functionality to develop and deploy Web applications on the server. IIS handles the request-response cycle on the Web server. It offers the service of SMTP and front-page server extensions. As you know SMTP is used to send emails and use FrontPage server extensions to get the dynamic features of IIS, such as form handlers.