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Adipose tissue is essential for providing smoothness and contour to the body due to its role in storing fat and forming a protective layer beneath the skin. This connective tissue is not only responsible for fat storage but also plays a role in insulation and cushioning the organs. The presence of adipose tissue contributes to the overall shape of the body, giving it a more rounded and smooth appearance.

Muscle tissue, while crucial for movement and strength, does not provide the same aesthetic smoothness or contour. Nerve tissue is primarily involved in transmitting signals throughout the body and does not offer any physical attributes such as smoothness. Cartilage, although it provides structure and support to joints and certain body parts, does not play a primary role in defining the body’s contour in the same way that adipose tissue does. Thus, adipose tissue is the correct answer, as it is specifically designed to enhance the body's smoothness and contour.