In nail care, what does the term “overlay” refer to?

The term “overlay” in nail care specifically refers to a product that is applied over the natural nail. Its primary purpose is to enhance the nail's strength and provide protection. Overlays can be made from various materials, such as acrylic, gel, or even silk. By applying an overlay, nail technicians help prevent damage to the natural nail while also improving its durability and appearance. This makes it particularly useful for clients who desire stronger nails or who may be prone to breaking or chipping.

Understanding overlays is essential for nail technicians as they often incorporate them into nail services to meet clients' needs for both aesthetics and nail health. The other options do not accurately represent the definition or function of an overlay in nail care. For instance, nail polish is cosmetic and does not inherently provide structural support. Similarly, the concept of applying a product beneath the nail does not align with the protective role of an overlay, nor does a nail art technique meet the supportive purpose that overlays serve.