What does the term "base coat" refer to in nail care?

In nail care, the term "base coat" specifically refers to a layer applied before the application of polish to prevent staining of the natural nails. The primary purpose of the base coat is to create a barrier between the nail surface and the colored polish, which can often contain pigments that may stain the nail. Additionally, a base coat can help improve the adherence of the polish to the nail, enhance the overall longevity of the manicure, and provide a smoother surface for color application.

The other options highlight different products used in the nail care process. A final layer for shine references a top coat, which is intended to provide a glossy finish and protect the color coat from chips and wear. A top coat for durability emphasizes the protective role a top coat plays but does not define the base coat. Similarly, the color coat for aesthetics describes the polish that provides color and can be layered over the base coat, rather than serving the preventive function of the base coat.