How do bike racks work and what are the different types available for transporting bicycles?

Bike racks are devices that attach to vehicles to transport bicycles. There are various types of bike racks, including roof racks, trunk racks, and hitch racks. Roof racks are mounted on the roof of the vehicle, trunk racks attach to the trunk or hatchback, and hitch racks connect to the vehicle's hitch receiver. Each type has its own advantages and considerations, such as ease of loading, security, and compatibility with different vehicle types.