A valet is usually an employee of the establishment, or an employee of a third party valet service. When there is a fee it is usually either a flat amount or a fee based on how long the car is parked. It is customary in the USA to tip the valet who actually parks the car. Valet parking is most often offered (and is most useful) in urban areas, where parking is scarce, though some upscale businesses offer valet parking as an optional service even though self-parking may be readily available. For example, in wealthy suburban areas like California's Silicon Valley, some hospitals (like Stanford University Medical Center) offer valet parking for the convenience of patients and their visitors. On the other hand, where parking is not scarce, such as on the Las Vegas Strip, it is offered as a convenience to patrons. Some hospitals, like the Yale-affiliated Greenwich Hospital (Connecticut) on Connecticut's Golden Coast, have such limited space for parking that the emergency room is valet parking only (to fit as many cars in as possible; see Efficiency, below).
Some cars come with an additional key known as a valet key that starts the ignition and opens the driver's side door but prevents the valet from gaining access to valuables that are located in the trunk or the glove box.