During a manicure, what is the purpose of using a nail file?

The purpose of using a nail file during a manicure is primarily to smooth the edges of the nails. A nail file helps shape the nail by filing down any rough or uneven edges, resulting in a neater and more polished appearance. This is essential for achieving the desired nail shape, whether it be square, round, or oval, and allows for a more professional finish.

While other options address aspects of nail care, such as polishing or removing cuticles, those functions are performed using different tools or methods. For instance, polishing typically involves the use of a buffer or polish, and cuticle removal is achieved with a specialized cuticle pusher or nipper. Conditioning the nails usually requires the use of oils or treatments, rather than a file. Thus, the direct function of the nail file is decisively linked to smoothing and shaping the nails, making this the correct choice.