Bonnet Catch

The bonnet catch is a small mechanism found underneath the bonnet, usually at the front. It is responsible for ensuring the bonnet stays locked in place when driving, containing a release lever which must be operated manually to open the bonnet for engine inspection.
Bonnet catches for any car are easily found, but it is highly recommended that you use only high quality bonnet catches. Faulty or poor quality bonnet catches can be particularly hazardous, as they can cause the bonnet to fly up while driving, obscuring vision and potentially damaging the car.
 

Bonnet Lock

The

bonnet Lock

secures the bonnet, preventing it from being opened without first being unlocked. Bonnet locks work on the same principle as standard car door locks, though the unlocking mechanism is usually found inside the car in the form of a lever which 'pops the bonnet'.
Quality bonnet locks for any car can be bought, though it's worth nothing that some newer cars- predominantly Fords have a key-lock on the bonnet itself, or in the front grille.