The King of Fighters (ザ・キング・オブ・ファイターズ, Za Kingu obu Faitāzu), officially abbreviated KOF, is a series of fighting games by SNK Playmore, formerly SNK. The series was originally developed for SNK's Neo-Geo MVS arcade hardware, which served as the main platform for the series until 2004, when SNK retired the MVS in favor of the Atomiswave arcade board and will move the series to the Taito Type X2 with the release of The King of Fighters XII. Ports of the arcade games and original The King of Fighters games have been released for the Neo Geo CD, Neo Geo Pocket, Game Boy and Game Boy Advance, N-Gage, Sega Saturn and Sega Dreamcast, PlayStation and PlayStation 2, and PC Xbox. One of the most recent games in the series are KOF: Maximum Impact series.

Source: Wikipedia