Eyelash extensions are synthetic or natural fibers that are attached to individual natural eyelashes to enhance their length, fullness, and curl. They come in various lengths, thicknesses, and materials, allowing for a customized look. The application process typically involves a trained technician using a special adhesive to bond the extensions to the natural lashes. The results can last several weeks, depending on the natural growth cycle of the eyelashes and proper care. Regular touch-ups are recommended to maintain the desired appearance as natural lashes shed and grow. Proper maintenance includes avoiding oil-based products and excessive rubbing of the eyes.