NBA 2K is a series of basketball sports simulation video games developed by Visual Concepts and released annually since 1999. The premise of the series is to emulate the sport of basketball, and more specifically, the National Basketball Association. The series was originally published by Sega. Beginning with 2005's NBA 2K6, the series is currently published by 2K (previously under the 2K Sports sub-label). As of 2022, the series consists of twenty-four main installments and several spinoff titles across eighteen different platforms. An official eSports league, the NBA 2K League, launched in 2018. Until 2018, the series' primary rival was EA Sports' NBA Live series.