THIS IS LADDER... LADDER IS A SIMPLE RANKING TOURNEYMENT THROUGHOUT THE ENTIRE B-NET....
If you have any questions regarding the Battle.net Ladder Ranking System, be sure to check through
the Ladder Frequently Asked Questions Page to see if you can find
the answers you're looking for.
Click here for detailed instructions on what to do if you
suspect abuse of the Battle.net Ladder system.
Click here for instructions on what to do if your
Battle.net Ladder record has been corrupted.
SOURCE : http://www.battle.net/ladder.shtml