Spam refers to unsolicited commercial advertisements distributed online. Most spam comes to people via email, but spam can also be found in online chat rooms and message boards. Spam can also be linking to potentially malicious software, PUMs, or PUPs. It can also link to surveys requesting personal information in order to download a program. You may also find adware and email worms, or phishing scams.
Spam consumes a tremendous amount of network bandwidth on the Internet. More importantly, it can consume too much of peoples' personal time if not managed properly.