A fingernail is a hard, protective covering located on the tips of the fingers. Made primarily of a protein called keratin, fingernails help protect the sensitive skin underneath and enhance the ability to pick up small objects. They grow from the nail matrix, which is located beneath the cuticle. Fingernails can vary in shape, size, and color among individuals. Regular care, such as trimming and cleaning, is important for maintaining healthy nails. Changes in the appearance of fingernails can sometimes indicate health issues, making them a useful indicator for medical professionals when assessing overall health.