Webopedia is a free online computer dictionary for words and terms related to computing, technology and internet fields. It provides definitions in a plain language so that ordinary people can easily understand. These definitions evolve and change together with technology so you will always get an up-to-date definition about the word you look for. New terms are added daily and many of them come from user's suggestions. In addition to this free service, the site also offers links to sources of further information on the topic where applicable. It is really an excellent source to find these kinds of definitions and it is easy to use.