An Internet troll is either a person who sends messages on the Internet hoping to entice other users in to angry or fruitless responses, or a message sent by such a person. The term derives from the phrase "trolling for newbies" and ultimately from trolling for fish; it first appeared on Usenet. The term is frequently abused to slander opponents in heated debates and is frequently misapplied to those who are ignorant of etiquette.

An Internet "troll" is a person who delights in sowing discord on the Internet. He (and it is usually he) tries to start arguments and upset people.

Trolls see Internet communications services as convenient venues for their bizarre game. For some reason, they don't "get" that they are hurting real people. To them, other Internet users are not quite human but are a kind of digital abstraction. As a result, they feel no sorrow whatsoever for the pain they inflict. Indeed, the greater the suffering they cause, the greater their 'achievement' (as they see it). At the moment, the relative anonymity of the net allows trolls to flourish.

Trolls are utterly impervious to criticism (constructive or otherwise). You cannot negotiate with them; you cannot cause them to feel shame or compassion; you cannot reason with them. They cannot be made to feel remorse. For some reason, trolls do not feel they are bound by the rules of courtesy or social responsibility.