The NASCAR Xfinity Series is a stock car racing series owned and operated by the National Association for Stock Car Auto Racing. It is promoted as NASCAR's "minor league" circuit, and is considered a proving ground for drivers who wish to step up to the organization's top level circuit, the Sprint Cup Series. Xfinity Series races are frequently held in the same venue as, and a day prior to, the Sprint Cup race scheduled for that weekend, encouraging fans to attend both events.