Joke programs are not harmful, but do something that the author considers to be funny. This often includes behavior that simulates the destructive effects of malicious code: for example, displaying a message telling the user that their hard drive is being formatted.
Synonyms: Spam, UCE [Unsolicited Commercial E-mail]
Spam is the name commonly given to unsolicited e-mail. It is effectively unwanted advertising, the e-mail equivalent of physical junk mail delivered through the post or from unsolicited telemarketing calls.