They represent both sides of a connection on the web. The server then brings it back to the client. Computers on the web work the same way. A web server is a program on a computer that takes incoming requests for information and sends out the appropriate files in response. Client A web client is a program like Netscape Navigator or Microsoft Internet Explorer.
Clients are programs that request information from servers on the Internet.
On the web, the client does most the work. The server sends out files and the client puts everything together. It's like buying a bench from a hardware store. Servers package up the goods, send them out and then expect the client to make all the pieces look the way they should. The server sends out the text file which contains a set of instructions back to the client.