The NBA Finals is the yearly championship series of the National Basketball Association (NBA). The Eastern and Western conference champions play with a best-of-seven game set to determine the league champion. The winners of the Finals are given the Larry O’Brien Championship Trophy, which replaced the Walter A. Brown Trophy in 1983.
The series was initially known as the BAA Finals before the 1949–50 season when the Basketball Association of America (BAA) merged with the National Basketball League (NBL) to form the NBA. The contest oversaw further name changes to NBA World Championship Series from 1950 to 1985, as well as a brief stint as the Showdown, before settling on NBA Finals in 1986. 
The NBA Finals was initially structured in a 2–2–1–1–1 structure. In 1985, to alleviate the amount of cross-country journey, it was changed to a 2–3–2 format, in which the first two and last two games of the series were played at the arena of the group who earned home-court advantage by getting the better record during the regular season. In 2014, the 2–2–1–1–1 format was restored. The first two matches are played with the higher-seeded team’s home, the following two at the house of the lower-seeded team, along with the remaining three are played at each team’s home arena alternately. 
A total of 19 franchises have won the NBA Finals, with the Toronto Raptors winning in 2019. The Boston Celtics maintain the record for the many victories, having won the competition 17 times, as well as the most consecutive titles, winning 8 times from 1959 to 1966. The Los Angeles Lakers have contested the NBA Finals the most times, with 31 appearances. The Eastern Conference has provided the most champions, with 38 wins from 10 franchises; the Western Conference has 32, from 9 franchises.
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