NETWORKS make many new types of applications possible because a SINGLE machine no longer has to do everything. Within a network, some computers, called servers, perform specialized tasks on behalf of other programs. A program that uses a server is a client.
A server is simply a computer that runs a specific program continuously whose role purpose is to provide a SERVICE to other programs. A client, on the other hand, is a program that receives service from the server. For example, a print server is a software program that waits until other programs (the clients) send their files to print. The server then prints the files on behalf of the client. There are many types of servers across the Internet with which you MAY be familiar, such as mail servers, file servers and of COURSE, World Wide (or HTTP) servers.

Networks make many new types of applications possible because a single machine no longer has to do everything. Within a network, some computers, called servers, perform specialized tasks on behalf of other programs. A program that uses a server is a client.
A server is simply a computer that runs a specific program continuously whose role purpose is to provide a service to other programs. A client, on the other hand, is a program that receives service from the server. For example, a print server is a software program that waits until other programs (the clients) send their files to print. The server then prints the files on behalf of the client. There are many types of servers across the Internet with which you may be familiar, such as mail servers, file servers and of course, World Wide (or HTTP) servers.