The NBA Finals is the annual championship series of the National Basketball Association (NBA). The Eastern and Western conference champions play a best-of-seven game series to determine the league champion. The champions of these Finals are awarded the Larry O’Brien Championship Trophy, which replaced the Walter A. Brown Trophy in 1983.
The series was originally known as the BAA Finals prior to the 1949–50 season when the Basketball Association of America (BAA) merged with the National Basketball League (NBL) to form the NBA. The competition oversaw additional name changes to NBA World Championship Series from 1950 to 1985, as well as a short stint as the Showdown, before settling on NBA Finals in 1986. 
The NBA Finals was originally ordered in a two –2–1–1–1 structure. Back in 1985, to alleviate the amount of cross-country travel, it was changed into a 2–3–2 format, in which the first two and last two games of the series were played in the stadium of the group who made home-court benefit by having the better record during the regular season. In 2014, the two –2–1–1–1 format was restored. The first two matches are played with the higher-seeded team’s home, the subsequent two at the house of the lower-seeded team, along with the remaining three are played in each team’s home arena . 
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 contest 17 times, as well as the most consecutive titles, winning 8 occasions 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 many winners, with 38 wins from 10 franchises; the Western Conference has 32, from 9 franchises.
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