Viruses   Computers can get a virus just like your body can be invaded with a virus making you (or your computer) sick. A virus can wipe out information on your computer and create major havoc. Viruses usually originate from malicious people. You can unintentionally download virus from a web site or get it from a disk that someone has lent you. There are virus-checking programs, but there are new viruses popping up every day. Therefore, the best defense against a virus is to be very careful not to download programs or data from a site you are not familiar with. VRML   Virtual Reality Modeling Language is a Programming Language, which has been designed to build 3D worlds on the World Wide Web. With this language, a programmer can create a virtual three-dimensional world, which the user can explore.