Answer:

Here are many definitions; here is one of the earliest: Ballet is "the geometrical groupings of people dancing together, accompanied by the varied harmony of several instruments" . This definition omits one feature commonly associated with ballets: they tend to tell stories.On the other hand, many modern ballets for example, many of Balanchine have no explicit plot. So we might also say, ballet is dancing done as a theatrical performance as an art, in fact frequently telling a story, and drawing on a tradition of expressive movements dating back to Beaujoyeulx and probably earlier.