Since this is really the first time people are getting to know the national baseball tournament, here's a history of the different formats that have been used.
The NCAA Tournament for baseball is one of the more unusual brackets used to crown a national champion. Save for softball, it's the only one that uses a double elimination format, meaning teams can lose games en route to a championship.
It's the only one with a standing location for its national champion. Where the location for the champion changes for football, basketball, soccer, and hockey, baseball crowns its champion every year in Omaha, Nebraska, a small city sandwiched just ahead of Rochester, New York and just behind Flint, Michigan in terms of media market size.