The venous system is a network of veins that carries deoxygenated blood back to the heart. It plays a crucial role in the circulatory system, ensuring that blood returns after delivering oxygen and nutrients to the body's tissues. The veins are equipped with one-way valves that prevent blood from flowing backward, helping maintain efficient circulation. Veins are categorized into superficial and deep veins. The superficial veins are located just beneath the skin, while the deep veins are found within muscle tissue. Together, they work to transport blood from various parts of the body, including the arms, legs, and organs, back to the heart.