iRacing.com is a browser-based motorsport simulation released in 2008 by iRacing.com Motorsport Simulations.
The software includes accurately simulated, laser-scanned race circuits. Servers for multiplayer racing are provided and official races are sanctioned by iRacing. The service is used both as a game for entertainment and by many amateur and professional racing drivers as a training and practice platform.
iRacing has 35,000 active members, paying a monthly or annual subscription to the service which grants access to a limited number of circuits and cars. Additional tracks and vehicles are purchased separately with iRacing credits. The service has been critisied regularly for it's expensive pricing model, which it is argued is caused by the large development costs associated with laser-scanning the real circuits.
Players are subject to iRating and Safety Rating. Both scores influence a driver's ability to compete online in against better players in different classes e.g. A, B, C etc.