Return to the Top of Page Along with gif files, one of two main graphics file formats used on the web, jpg files can support millions of different colours, and are best suited to photographic type images. Return to the Top of Page A plugin is a patch or program which has been added to a browser to deal with specific types of files. Plugins were frequently needed for older browsers to deal with new technology, but modern browsers tend to have all the necessary plugins already built in. Portal sites should be well designed to make the advertising fit in with the overall look, and also to keep users coming back on a regular basis. Return to the Top of Page A proxy is a specialized server which a browser can be configured to use.
Some proxies can also store copies of frequently requested pages to improve response times.
Return to the Top of Page Search Engines are an essential part of the world wide web. They automatically index all websites they learn about, and maintain a database of keywords. Strictly speaking, many modern Search Engines are really directories, where sites have actually been reviewed by human beings and placed in an appropriate category. Return to the Top of Page A server is a computer which processes requests from a number of clients. Return to the Top of Page Spam is the colloquial term for unsolicited email which is sent to a huge list of addressees.