An auto mechanic is a skilled professional who specializes in repairing, maintaining and diagnosing problems with automobiles. They have knowledge about internal combustion engines, electrical systems, suspension systems, brakes, steering and alignment, air conditioning and heating systems, and other components that make up an automobile. Auto mechanics work on all types of vehicles including cars, trucks, motorcycles, and heavy equipment. They use a variety of tools and diagnostic equipment to diagnose problems and perform repairs. Many auto mechanics also have knowledge about electronics and computer systems in modern vehicles. Overall, an auto mechanic is someone who can keep your car running smoothly by performing regular maintenance and making necessary repairs when needed.