What is the primary purpose of using a base coat in nail care?

The primary purpose of using a base coat in nail care is to protect the natural nail from staining. A base coat creates a barrier between the nail and the colored polish, which can often contain pigments that might discolor the nail over time. By applying a base coat, you not only help to prevent stains but also promote better adhesion of the polish, leading to a longer-lasting manicure.

While adding color to the nails is a function of nail polish rather than a base coat, a base coat is transparent or lightly tinted and does not serve this purpose. Providing shine is the function of a top coat, which is designed to provide a glossy finish to the nails after the color is applied. Speeding up the drying process is not a characteristic of a base coat, as its main role is more about protection and adhesion rather than affecting drying times.