Also called an appserver. A program that handles all application operations between users and an organization's backend business applications or databases.

Other programs and tools that manage network resources.

FTP stands for File Transfer Protocol, it is a program dedicated to transferring files between computers. It is often used for uploading web pages and downloading programs.

A server that sits between a client (Web browser), and a real server. It intercepts all requests to the real server to see if it can fulfill the requests itself. If not, it forwards the request to the real server.

Short for HyperText Transfer Protocol, the underlying protocol used by the World Wide Web. This type of servers deliver (serve up) Web pages.

Programs that run on the server to mangage routine tasks such as link checking.

That's right, this one is for E-mail deliveries. Most E-mail applications use the POP (Post Office Protocol), although some can use the newer IMAP (Internet Message Access Protocol).

Every Web server is capable of writing log files that list requests (actions) that have occurred. Those programs help to analyze records in log files.