A choir is a group of singers who perform together, typically in harmony. You might see a choir singing at a school concert, a religious service, or a special community event.

What makes a choir different from just people singing together is the organization: choir members usually sing different vocal parts (soprano, alto, tenor, bass) that blend to create rich, layered music. A soprano might sing the high melody while an alto harmonizes below, and the tenors and basses provide deeper support. When done well, a choir sounds fuller and more powerful than any single voice could sound alone.

Choirs often have a conductor or choir director who leads rehearsals and guides the performance. Members learn to watch the conductor's hands, match each other's volume, and breathe at the right moments. The challenge and joy of choir singing is learning to blend your voice with others rather than standing out, something many singers find surprisingly difficult at first.

People also use choir metaphorically when they say you're “preaching to the choir.” This means you're trying to convince people who already agree with you, like giving a speech about why recess is important to a group of students who already love recess.