In the NBA preseason, each team has a warm-up match.
At the end of each season, each team made considerable changes to their lineup. Some teams even changed their coaches. So the NBA held preseasons to let the teams have a chance to try out their lineups. It allowed them to get familiar with the how every player and team played. It helped with determining the actual lineups in the regular season. It also helped increase the communication between the players and the coaches. It helped them get into the mindset that was needed for the arduous regular season.
Typically, the preseason lasted two weeks. In those two weeks, a team played about eight games. In recent years, the NBA increased its internationalization efforts to cater to the tastes of overseas fans. It sent teams to play preseason games overseas, in addition to inviting overseas teams to come to the United States to participate in the NBA preseason.
