This is a list of National Association for Stock Car Auto Racing (NASCAR) champions; that is, a list of all the champions in NASCAR's three major series (Sprint Cup, Nationwide Series, and Craftsman Truck Series). The NASCAR championships are awarded at the end of each season to the driver who has amassed the most points throughout the year. The point totals are determined each week by the driver's final position in a race and the amount of laps they have led in it. The current points system was adopted by NASCAR in 1975 and continues into the present day NEXTEL Cup with slight changes and a ten-race playoff format created in 2004. The Busch Series and the Craftsman Truck series have always used this system, sans the playoff.