Various types of hair slides
A hair barrette on the back of a lady's head
A barrette (also called a hair clip or hair-slide in British English) is a clasp for holding hair in place. These clasps are often made from metal and/or plastic, and sometimes feature decorative fabric. In one type of barrette, a clasp is used to secure the barrette in place; the clasp opens when the two metal pieces at either side are pressed together.
Barrettes are worn in different ways partly according to their size, with small ones often used at the front and large ones in the back to hold more hair. In some cases they are used to keep hair out of the eyes, or to secure a hairstyle such as a ponytail, but their use can also be purely ornamental. Short metal "clip" barrettes are sometimes used to pull back front pieces of hair. Barrettes are also sometimes used purely for decorative purposes.
Larger barrettes (some can be as long as 3–4 in (8–10 cm)) are designed to pull back longer hair or a large amount of hair, and are usually worn at the back of the head. If the intent is to pull back hair, the length of the barrette is not the only consideration; the width of the barrette also indicates approximately how much hair can be secured by it.