RasenBallsport Leipzig e.V., commonly known as RB Leipzig, is a German association football club based in Leipzig, Saxony. The club was founded in 2009 by initiative of energy drink-maker Red Bull GmbH who purchased a playing right of the fifth division side SSV Markranstädt with the intention of advancing the new club to the top-flight Bundesliga within eight years. Men's professional football is run by the spin-off organization RasenballSport Leipzig GmbH. RB Leipzig plays its home matches at the Red Bull Arena. In its inaugural season in 2009–10, RB Leipzig dominated the NOFV-Oberliga Süd (V) and was promoted as champions to the Regionalliga Nord (IV). RB Leipzig won the 2012–13 Regionalliga Nordost season without conceding a single defeat and was promoted to the 3. Liga (III), then finished the 2013–14 3. Liga season as runner-up and was promoted to the 2. Bundesliga (II) as the first team since the introduction of the 3. Liga to win promotion after only one season. On 8 May 2016, RB Leipzig ensured promotion to the Bundesliga for the 2016–17 season with a 2–0 defeat of Karlsruher SC. One year later, RB Leipzig captured a place in the 2017–18 UEFA Champions League by finishing as runner-up of the Bundesliga.
Description above from the Wikipedia article RB Leipzig, licenced under CC-BY-SA, full list of contributors on Wikipedia.