Binary form

Binary form (also know as AB Form or movement of continuity) is a type of form of music pieces. The word Binary means "in two parts." The word Form is a kind of guideline for composers when they write a piece of music. So, binary form means "An outline in two parts." A musical piece in binary form is a musical piece with two sections. Binary form was popular in the Baroque times and was often used for movements in sonatas for keyboard instruments.^[1] Each part of a binary form piece of music are usually repeated.

1. ↑ "Binary form". Britannica.