Generally said spam is electronic junk mail or junk newsgroup postings. Some people define spam even more
generally as any unsolicited e-mail. However, if a long-lost
brother finds your e-mail address and sends you a
message, this could hardly be called spam, even though it's unsolicited. Real spam is
generally e-mail advertising for some product sent to a mailing
list or newsgroup.
In addition to wasting people's time with unwanted e-mail, spam also eats up a lot of network bandwidth. Consequently, there are many organizations, as well as individuals, who have taken it upon themselves to fight spam with a variety of techniques. But because the Internet is public, there is really little that can be done to prevent spam, just as it is impossible to prevent junk mail. However, some private online service, such America Online, have instituted policies to prevent spammers from spamming their subscribers.
There is some debate about the source of the term, but the generally accepted version is that it comes from the Monty Python song, "Spam spam spam spam, spam spam spam spam, lovely spam, wonderful spam " Like the song, spam is an endless repetition of worthless text. Another school of thought maintains that it comes from the computer group lab at the University of Southern California who gave it the name because it has many of the same characteristics as the lunchmeat Spam: