What is the difference between gta story mode and gta online?

Grand Theft Auto: San Andreas Story Mode is a 2004 single-player action-adventure game where you control Carl 'CJ' Johnson as he returns to San Andreas in 1992 after his mother's murder. The campaign follows his efforts to rebuild his former gang while uncovering corruption and rival criminal organizations. GTA Online, released in 2013 as a free update for San Andreas owners, is a separate multiplayer experience that takes place in the same fictional state but years after the original story's events. While Story Mode has a fixed narrative with set missions and a definitive ending, Online features ongoing content updates, player-driven activities, competitive and cooperative modes, and a persistent world where players can create their own characters and pursue various objectives through regular events and seasonal content.