Is gta online a sequel or standalone game?

Grand Theft Auto Online was released as an add‑on to the single‑player game Grand Theft Auto V. It runs in the same open‑world setting of San Andreas and allows up to 30 players to explore, compete and cooperate in a shared online environment. Because it uses the same engine, map, and many of the same assets as GTA V, it is considered a component of that game rather than a separate, narrative sequel. The game was developed by Rockstar North and published by Rockstar Games, with releases across multiple console generations and on Windows. It expands the player experience of GTA V with persistent online content, but it does not continue a new story line separate from the base game.