 MLB uses a "2-3-2" format for the final two rounds of its postseason tournament.The singular term "playoff" is reserved for the rare situation in which two (or more) teams find themselves tied at the end of the regular season and are forced to have a tiebreaking playoff game (or games) to determine which team will advance to the postseason.Thus, a "playoff" is actually "part of the regular season" and can be called a "pennant playoff".