Final answer:
Sonata form is a musical structure consisting of three main sections: an exposition, a development, and a recapitulation.
Step-by-step explanation:
Sonata form is a musical structure consisting of three main sections: an exposition, a development, and a recapitulation. The exposition introduces the main musical themes, the development section explores and develops these themes, and the recapitulation restates the themes in a modified way. This form is commonly used in Classical music and provides a clear structure for composers to organize their compositions.