Which procedure is performed to improve the appearance of a client's nails?

A manicure is specifically designed to enhance the appearance of a client's nails. This procedure typically includes cleaning, shaping, and polishing the nails, as well as providing care to the surrounding skin. The focus is on improving the overall aesthetic of the nails, which can involve techniques such as filing, buffing, and the application of nail polish or treatments that enhance shine and health.

In contrast, while pedicures also aim to improve nail appearance, they specifically target toenails and foot care. Nail art focuses on the creative decoration of nails, which may follow a manicure but is not primarily aimed at enhancing the nails' basic appearance. Fingernail enhancement refers to additional procedures like acrylics or gels, which can change the shape or length of nails but may not necessarily improve their natural appearance. Thus, the primary goal of a manicure aligns best with the question's focus on enhancing nail appearance.