Wrap advertising or a
vehicle wrap describe the marketing practice of completely or partially covering (wrapping a vehicle in an
advertisement or
livery. The result of this process is essentially a mobile
billboard. Wrap advertising can be achieved by
painting a vehicle's outer surface, but an increasingly ubiquitous practice in the 21st century involves the use of large
vinyl sheets as "
decals". The vinyl sheets can later be removed with relative ease, drastically reducing the costs associated with changing advertisements. While vehicles with large, flat surfaces (such as
buses and
light-rail carriages) are often used,
automobiles can also serve as hosts for wrap advertising, despite consisting of more .