Every time you send e-mail to someone you're uploading it. Usenet A collection of so-called news groups that have nothing to do with news. Usenet's are ongoing discussion groups among people on the Internet who share a mutual interest. The Usenet is one of the prime areas where pornography and child pornography are posted. A virus can wipe out information on your computer and create major havoc.
Viruses usually originate from malicious people.
You can unintentionally download a virus from a web site or get it from a disk that someone has lent to you. There are virus-checking programs, but there are new viruses popping up every day. So the best defense against a virus is to be very careful not to download programs or data from a site you're not familiar with. An acronym for Wide Area Information System which basically means lots of large databases you can search through. It was designed by WAIS Corp. as a way of accessing very large databases.