Which technique is commonly used in preparing the nails before applying nail polish?

Buffing is a commonly used technique in preparing the nails before applying nail polish because it helps to create a smooth and even surface for the polish to adhere to. By buffing the nails, any ridges, imperfections, or shine can be minimized, which ensures that the polish goes on more evenly and lasts longer. Additionally, buffing can help to promote nail health by stimulating circulation in the nail bed and removing dead skin cells, which contributes to a polished and professional finish.

While cutting involves trimming the nails, and styling pertains to the overall design or appearance after polish application, these actions do not specifically enhance the preparation of the nail surface itself in the same way buffing does. Pilling is not a recognized technique in nail preparation and may refer to a different context entirely. Thus, buffing is the most relevant and effective technique for achieving the best results in nail polish application.