What is leasing?

Who is the registered keeper and owner? What are the advantages of car leasing? Do you pay interest on a lease vehicle? Can I lease a used vehicle? Can I ever own my lease car? Are there downsides to leasing? How does leasing work? How long can I lease a car for? Is leasing right for me? Are there different types of vehicle finance? How is leasing different to buying? How is contract hire different to a PCP? What is contract hire? What are you paying for within a lease? What is vehicle leasing?