Reputation is the score of our profile i think steemit has done a wonderful work by bringing the reputation of any profile. One can identify his content how he is dealing with blogs and because of it the fake contents which are copyright or spam can me removed and only legit contents can be given real value. Reputation score decide how much user is writing the blogs useful to other or not.
On an average everyone get reputation of 25 and they have to build their reputation toward upward and if someone has reputation of less than 25 then his profile either use by bot or he content will be copyright.