IIS is Microsoft's web server software, supplied with various Server versions of Windows.
IS is the abbreviation for Internet Information Server. IIS is written by Microsoft's to compete in the Internet server market that is also addressed by its main competitor Apache. IIS is a file and web application server that can be used on a local area network (LAN), a wide area network (WAN), or the Internet. Internet Information Services (IIS) 6.0 is a powerful Web server that provides a highly reliable, manageable, and scalable Web application infrastructure for all versions of Windows Server 2003. IIS helps organizations increase Web site and application availability while lowering system administration costs.

IIS 6.0 supports the Microsoft Dynamic Systems Initiative (DSI) with automated health monitoring, process isolation, and improved management capabilities. Thinking of upgrading? Read this: Should I Upgrade to IIS 6.0? Admins, Webmasters, and Web application developers obtain a reliable and high performance Web server. IIS 6.0 and Microsoft Windows Server 2003 introduced new features for Web applications for server reliability and availability, managements, scalability, and security. The benefits of deploying IIS 6.0 include less planned and unplanned system downtime, increased Web site and application availabilities, low system administration costs, server consolidations and a significant increase in Web infrastructure security.