Virtually everyone who uses the search term "nascar" is looking for Web sites with content about NASCAR racing. NASCAR is an acronym for the "National Association For Stock Car Auto Racing," which began in 1947 by organizing races run on the Daytona Beach road course. It has grown into a major brand for stock car auto racing, including two major racing series: The Winston Cup and the Busch Grand National.

The rules for what makes a stock car stock are specific to each sanctioning body. By NASCAR rules, the block and cylinder heads of a stock car's engine are required to be of original equipment manufacture, and the car is required to be available to the public as a consumer production model. Indeed, there was a time when a stock car racer could go to a dealership and buy a race-ready car. However, as stock car racing has evolved, stock cars have also evolved to incorporate many features designed specifically for high-speed safety, features which would be impractical to incorporate into a street car.