A necklace is a piece of jewelry that is worn around the neck. Necklaces can be made from a range of materials, including precious metals, beads, stones, and other decorative elements. Some of the common types of necklaces include:

1. Choker: a close-fitting necklace that sits tightly around the neck.
2. Pendant: a necklace with a decorative element hanging from a chain or cord.
3. Locket: a pendant that opens to reveal a small compartment, often used to store a photograph or a lock of hair.
4. Strand: a necklace made up of a series of beads or pearls strung together on a cord or string.
5. Beaded: a necklace made of beads strung together to create a pattern or design.
6. Chain: a necklace made of interlocking links of metal, typically gold or silver.
7. Collar: a close-fitting necklace that sits high on the neck and covers the collarbone.
8. Opera: a long necklace that falls to the waist or below.

Necklaces are often worn for both fashion and functional reasons, and can be paired with a range of outfits to create a desired look. They can be simple and understated, or elaborate and ornate, and can be made from a wide range of materials to suit a range of tastes and styles. In many cultures, necklaces have symbolic meaning, and are often given as gifts to commemorate special occasions or to express affection.