When someone steals your personal information and pretends to be you.
A program that automatically downloads advertisements to your computer. It is not usually dangerous, but can be a problem if it is combined with spyware, software that tracks and sells your personal information.
An email alias is a different email address you can use that forwards your email to your regular account. This stops spammers from learning your real email.
A program that searches your computer for viruses, then removes or deletes them.
A message you can post on your IM service that describes what you’re doing. (for example: “I am away from my computer right now.”)