This is an acronym used in baseball which stands for National League Championship Series. The National League is one of two major divisions, sometimes called leagues, in Major League Baseball. The other is the American League. The Championship Series is the name of the final series of playoff games prior to the World Series. The winner of the championship series goes on to play in the World Series, and is also considered the National League Champions. In order to get to the NLCS, a team must first make the playoffs by playing better than many other teams during the regular season. Once in the playoffs, the team is matched up with another team in a divisional series, and then the winners of those two series play each other in the championship series.
Currently, the structure of the championship series is a best-of-seven games, with the winner moving on to the World Series. However, prior to 1984, the championship series was only a best-of-five games. In that era, home field advantage would alternate; the teams would play the first two games on the home field of the team with the worse regular season record, and play the last 3 on the home field of the team with the better record, giving them the coveted "home field advantage." When Major League Baseball changed the championship series rules in 1985 to be a best-of-seven series, the structure changed to a 2-3-2 format, with the first and last two games being played on the home field of the team with the best regular season record of the two teams, and the middle three games being played on the home field of the team with the worse regular season record. If a "wild card team" is involved in the championship series, the division winner gets home-field advantage, regardless of the regular season win-loss records. The National League Championship Series is identical to the American League Championship series in terms of structure.