A bra is a form-fitting undergarment designed to support or cover a womans breasts. The word "bra" is short for "brassiere" or "brassière". The term "brassiere" comes from the French word "brassière," which means "arm protector". The bra consists of a chest band that wraps around the torso, supporting two breast cups that are held in place by shoulder straps. A bra usually fastens in the back, using a hook and eye fastener, although bras are available in a large range of styles and sizes, including front-fastening and backless designs. Some bras are designed for specific functions, such as nursing bras to facilitate breastfeeding or sports bras to minimize discomfort during exercise. Bras may be designed to enhance a womans breast size, create cleavage, or for other aesthetic, fashion, or more practical considerations.

In summary, "bra" is short for "brassiere" or "brassière," which is a form-fitting undergarment designed to support or cover a womans breasts.