Base coat and top coat are both essential components of a manicure or pedicure. The base coat is applied first and acts as a protective layer between the nail and the colored polish. It helps to prevent staining, strengthens the nails, and provides a smooth surface for the polish to adhere to. On the other hand, the top coat is applied as the final layer and serves multiple purposes. It adds shine and gloss to the nails, enhances the longevity of the manicure, and protects the polish from chipping and peeling. Additionally, the top coat can also speed up the drying process, giving a quick and flawless finish to the nails.