Every time you send e-mail to someone you are uploading it. Usenet A collection of so-called news groups that usually have nothing to do with news. Usenets are ongoing discussion groups among people on the Internet who share a mutual interest. It was originally used to provide news and discussion areas for the researchers and other similar types of groups, such as technical discussions of server operation procedures among system administrators, or to announce news within those fields. A virus can wipe out information on your computer, or fill your computer with TONS of useless files, thus clogging your hard drive, and just create major havoc generally.
Viruses usually originate from malicious people.
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. WWW An acronym for the World Wide Web.