A barre is a stationary handrail that is used during ballet warm up exercises. The term also refers to the exercises that are performed at the barre, as well as that part of a ballet class that incorporates barre exercises.

Barre exercises include both slow exercises, which stretch and warm up muscles, and fast exercises, which help dancers strengthen muscles and maintain technique at any speed. Each barre exercise has a specific purpose, such as to strengthen feet, increase extension, improve flexibility, and help a dancer find their ballon. Proper placement (positions of feet and arms in ballet) and posture is emphasized in all exercises.

Source : Wikipedia 

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