Is gta v online mode a separate game from story mode?

The Wikipedia excerpt describes Grand Theft Auto V as a 2013 action-adventure game with a single-player story mode featuring three protagonists and an open world set in San Andreas. However, the evidence does not mention GTA Online or any multiplayer components. Without information about the online mode in the provided source, it cannot be determined from this evidence whether the online mode is a separate game or integrated into the main title. Additional sources would be required to answer this question definitively.