GRID multiplayer allows you to race online against other people, up to 16 in a single session.
Quick match Edit
When joining a lobby players enter a game mode called Skirmish, where they can crash into one another with the Jupiter Eagleray Mk5 (this somewhat resembles Demolition Derby from earlier GRID titles, however there is considerably less (optical) damage and no rounds to be completed).
During this period players may select their car for the next race via menu. Quick match events consist of a series of 3 races.
It is possible to become the lobby "host", however this provides no additional options in quick matches.
Custom match Edit
Custom matches allow you to create a custom event to your liking. It is either invite only, available to your friends on the respective platform or console, or publicly visible in Session Search.
Like in quick match, it is possible to become the lobby "host" and change lobby settings.
Session Search Edit
In session search you can find custom matches and lobbies that fit the given search criteria.