Crystal nail art refers to the decorative technique of applying small, decorative crystals or beads to nails. This style is popular for its shimmering and luxurious look. The process typically involves using a glue or adhesive to secure the crystals onto the nails, which can be done manually or with the help of a special applicator. Crystal nail art is often seen at beauty salons and can be a fun and creative way to customize one's nails.