Earthing and Bonding Cable definitions:
Earthing is a safety measure to prevent electric shock or damage to equipment. The cable provides a low resistance path for electric current to flow to earth in the event of a fault. For example, if there is an electrical fault in an appliance, the fault current flows to earth through a protective conductor. A protective device such as a fuse or relay switch in the consumer unit switches off the electric supply.
Bonding is simply a term used for connecting all the metallic parts that should not be carrying electric current to the same electrical potential. This means that no electrical current can flow between these parts. The primary reason for bonding is to prevent a person getting a shock. By earthing these bonded elements, it protects people and equipment from harmful electrical faults.