It is run over a distance of 1 mile (1,609 metres) at Sandown Park in late April.
The event was established in 1985, and it was initially sponsored by Trusthouse Forte.
The online gambling company Bet365 became the sponsor in 2008, and the event is currently known as the Bet365 Mile.
The Sandown Mile is staged during a two-day meeting which features both flat and jump races.
Other events at the meeting include the Bet365 Gold Cup, the Celebration Chase, the Gordon Richards Stakes and the Sandown Classic Trial.