The games graphics pipeline features the most advanced techniques based on hardware specifications. When it comes to graphics and optimization, GTA V is undoubtedly a technical masterpiece.
You will find graphics mods to make the overall graphics look more realistic, take control of any NPC, more appearance customization, tweakable physics properties, and lots more.
GTA Online allows you to play either in free mode, with your friends, or against other players. Even though Rockstar communicated they don't consider GTA Online as part of GTA V, they may have lots in common.
Each of them has a unique and deep background that makes them more authentic and strengthens the narrative.