Exposition: The exposition is the first section in sonata form where musical ideas are introduced. It sets up contrasting themes and establishes tonal relationships.
Development: The development is a section in sonata form where musical material from the exposition is manipulated, transformed, and explored in different keys.
Coda: The coda is an optional section at the end of a piece that provides additional closure or adds finality to the music. It often contains new material or variations on existing themes.