What is the "rep"?

in this forum of course. and how can i more or less rep?

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Rep = Reputation

A quote:

Reputation rating which is voted on by other players who decide to either prefer or avoid another player

http://microsoft.wikia.com/wiki/Xbox_Live

In-game press "Home", go to your gamertag and press "View rep" to see what your current reputation is within the Xbox/Live community.

|||and why i have this reputation if anibody loves me? XD|||

I need to get my Rep on this account back up. My old was around 5 Star. :)