There are six major NASCAR sanctioned series': the Nextel Cup Series, the Busch Series, the Craftsman Truck Series, the NASCAR Canadian Tire Series, the NASCAR Regional Racing and the Dodge Weekly Series. Each series runs races on a particular set of tracks, each with its own special attributes, making each race unique and offering pluses and minuses depending upon each driver's style and abilities.
The single most important event in the NASCAR season is the Nextel Cup Series. In 2003, after R.J. Reynolds dropped its sponsorship of the major racing events, Nextel took up the mantle to become the sponsor for the single most important event in NASCAR racing. However, because of the pending merger between Nextel and Sprint, the Cup is set to change names in 2007 to the Sprint Cup.
The Busch Series, sponsored by Anheuser-Busch, is the second highest level of NASCAR racing competition. There are slight differences in the cars and the season is slightly shorter than the Nextel Cup. The prize money is correspondingly lower as well. Some drivers consider the Busch Series good practice for the Nextel Cup races.
After the Busch Series, the next level of competition is the Craftsman Truck Series. As the name implies, the race features modified pickup trucks. Formed in 1995, the Craftsman Series was considered something of a novelty at first. Eventually popularity grew enough for the series to feel 'respectable'.
The Canadian Tire Series, often referred to as CASCAR is the fourth series in the NASCAR crown. NASCAR acquired the Canadian racing series in September of 2006 and will begin racing the series in 2007. It will replace CASCAR's Super Series.
The two remaining sup series': NASCAR regional racing and the Dodge Weekly Series are local events that are held throughout the United States and Canada. Drivers compete, based on a formula, to win the Dodge Weekly Series National Championship, among other titles.