Automatic Number Plate Recognition (ANPR) in the United Kingdom is a system that uses special cameras to capture images of number plates on cars. The captured images are then used to check the cars' number plates against an official road traffic database. This system helps make sure that cars are registered and not being used to commit any kinds of crimes. It also allows police to quickly know who is driving the car and if they have a valid license or not. The cameras can also be used to track cars that may have been stolen or used in a crime.