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will keep you periodically up-to-date on what is happening at The Baseball Cube.
Playoffs is a universal term used by many baseball leagues and many other sports to designate the post-season tournament, whatever form it may take, that is used to determine a single champion at the end of the season. It is essentially the goal (or should be) for teams to win this championship and at various levels, its importance may vary depending on the intended mandate of the league or team. In other words, for youth sports, its about having fun and getting better. For Major League Baseball, its all about winning.
The MLB Playoffs are the only playoffs we track. Though each team has a single line descriptor for each season to summarize the team's playoff participation (League Champions, lost in x round), we track the full MLB Playoffs from season to series to game to at bat.
The structure of the MLB Playoffs has evolved over time towards more of a tournament format with 4 rounds of various durations. 1-game wild card, best-of-5 Divisional Series, best-of-7 League Championship Series and best-of-7 World Series. Playoff stats are captured by series instead of in aggregate, like many sports. Why? No idea. Convention. Awards are handed out for MVPs of both the League Championship Series and the World Series.
TBC has data since 1957 for boxscore data and 1903 for Playoff series results. Series-level statisics are available since 1903 as well with game-level data available only from 1957-present. Adding playoff stats is not of utmost priority and so you will find often that we are a bit behind.