What is Web server, which web servers you know?

Web server is an infrastructure that uses hypertext transfer protocol to respond client request s over internet. Its main function is to store, process and deliver web pages requested to web site visitors. In addition web server also supports Simple Mail Transfer Protocol (SMTP) and File Transfer Protocol (FTP) protocols for email, file transfer and storage. Microsoft Internet Information Services (IIS) and Apache Tomcat are some Examples of a web server.