A two-seated bicycle, also known as a TANDEM, is a bicycle designed for two people to ride at the same time. It has two seats and two sets of pedals, one in front of the other. The person in the front is known as the captain, and the person in the back is known as the stoker. The captain steers the bike and controls the brakes, while the stoker provides additional power to the pedals. TANDEM bicycles are popular among couples and friends who want to enjoy a leisurely ride together.