Online fighter games are video games that focus on hand-to-hand combat, martial arts, or weapon-based fighting between characters, typically in one-on-one or team battles. These games can feature either a highly stylized or realistic approach to combat, often with a variety of special moves, combos, and character abilities. They are generally fast-paced, requiring quick reflexes, strategic thinking, and practice to master.

Online fighter games can be played against other players in real-time, adding a competitive multiplayer element. They are available on various platforms, including web browsers, mobile devices, and consoles.