Final answer:
In sonata-allegro form, the development section features frequent modulations and exploration of foreign keys, creating tension and drama before the music resolves back to the home key in the recapitulation.
Step-by-step explanation:
In sonata-allegro form, the development section is characterized by frequent modulations and wanders through a series of foreign keys. This part of the form serves to develop the themes introduced in the exposition by varying them, combining them, and exploring different tonal areas. It contrasts with the exposition, where two opposing themes are introduced (exposed), and the recapitulation, where the themes are restated in the home key. The development plays a crucial role in creating tension and drama in the musical narrative before resolving back to the home key in the recapitulation.