The NatWest Series was a limited-overs cricket tournament held in England, featuring One Day Internationals (ODIs). It typically involved three teams, including the England cricket team and two other international teams. The series was sponsored by the NatWest Group, a major banking institution in the UK, and took place annually from 2000 to 2006. The format of the tournament usually consisted of a round-robin stage, where each team played against the others, followed by a final to determine the champion. The NatWest Series was known for its competitive matches and contributed to the popularity of ODI cricket in England.