Phishing (credit given to Wikipedia)

What is Phishing?

In computing, phishing is the act of attempting to fraudulently acquire through deception sensitive personal information such as passwords and credit card details by masquerading in an official-looking email, IM, etc. as someone trustworthy with a real need for such information. It is a form of social engineering attack. See an example.

The term was coined in the mid 1990s by crackers attempting to steal AOL accounts. An attacker would pose as an AOL staff member and send an instant message to a potential victim. The message would ask the victim to reveal his or her password, for instance to "verify your account" or to "confirm billing information". Once the victim gave over the password, the attacker could access the victim's account and use it for criminal purposes, such as spamming.