In the case of the web they are used to mark a site that you want to return back to at a later time. Some of the more popular ones are Microsoft Explorer, Netscape and Mosaic. When you return to a certain web page that you have visited before, the program will access the cached images or pages. The pages will now come up quicker since the graphics and texts do not have to be downloaded again. This term is also used for software used to connect to a host computer, such as a Gopher or Mosaic client program.
Zip files are the most common.
A cookie is a small piece of information that a Web server sends to your browser to hold on to until its time for the server to read the information. Cookies contain information about the sites that are visited and pages that you access. The posting of the same article to several newsgroups. The text based Internet addressing system that connects a domain name to a specific numeric IP address. A domain name is portable, meaning it can remain the same but its IP address can change.