From the description incase you're lazy like
Description wrote:Watch the new Official Gameplay Video for Grand Theft Auto Online - which shows how we've taken the fundamental GTA concepts of freedom, ambient activity and mission-based gameplay and made them available to multiple players in an incredibly detailed and responsive online world.
In Grand Theft Auto Online, you'll have the freedom to explore alone or with friends, work cooperatively to complete missions, band together to participate in activities and ambient events, or compete in traditional game modes with the entire community, all with the personality and refined mechanics of Grand Theft Auto V.
Access to Grand Theft Auto Online is free with every retail copy of Grand Theft Auto V and launches on October 1st.