How does the points system work in professional boxing?

In professional boxing, how does a boxer earn a point and loose a point?|||you dont earn points, each person starts with 10 points. the loser of the round (determined by a judge) gets only nine points, and usually if a boxer gets knocked down they will take a point away. The referee in the ring will determine win a point will be taken away for things like illegal punches, hitting below the belt, etc.|||10-7 rounds happen fairly often to tell you the truth, and sometimes a fighter can lose a round 10-8 without getting knocked down or penalized if a judge feels one fighter dominated; i saw it happen twice in one antonio tarver fight|||Robert is correct, the winner gets the full ten pts while the loser automatically gets nine unless they were knocked down which typically cost them another point or the ref penalizes them for one thing or another such as a low blow which typically costs a point. Most rounds are probably 10-9 with some being 10-8. I have never seen a 10-7 round in a fight that I have watched but I imagine it does happen