A bucket seat is a seat contoured to hold one person, distinct from bench seats which are flat platforms designed to seat multiple people. Bucket seats are standard in fast cars to keep riders in place when making sharp or quick turns. According to the Oxford English Dictionary, the name derives from the seat "partly resembling a bucket in shape". Racing vehicles usually have only one bucket seat. Vehicles sold to the general public often have two bucket seats in the front compartment, and may contain more in a rear compartment. Commercial aircraft now have bucket seats for all passengers.