Superficial veins are blood vessels located just beneath the skin's surface. They play a crucial role in returning deoxygenated blood from the extremities back to the heart. These veins are often visible and can be seen in areas like the arms and legs. Unlike deep veins, which are located deeper within the body and are surrounded by muscles, superficial veins are more accessible. They are important for regulating body temperature and can expand or contract to help manage blood flow. Conditions like varicose veins can occur when these veins become enlarged or twisted.