What's exactly is an "troll"?

Question

In computer reference. I here allot of people calling other people that on here. I think someone called me a troll once on here.

What is the troll thing about, sounds more goofy to say that then actually being a troll if you ask me.

Answer 1

A troll lives under a bridge and f***s with billy goats.

Answer 2

An Internet troll, or simply troll in Internet slang, is someone who posts controversial and usually irrelevant or off-topic messages in an online community, such as an online discussion forum or chat room, with the intention of baiting other users into an emotional response[1] or to generally disrupt normal on-topic discussion.[2]