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The results of each race are combined to determine two championships in each of the top series, one for drivers and one for manufacturers. The Drivers' Championship is awarded to each division's most successful NASCAR driver over a season, as determined by a points system, and has been awarded since the first NASCAR season in 1949. The Manufacturers' Championship is awarded to the each division's most successful NASCAR manufacturer over a season, also determined by a points system based on race results. The Manufacturers' Championship was first awarded in 1952.
Seasons
Note: In any given season, the overall Manufacturer's champion may not been the supplier to the overall Driver's champion.