A clap is the percussive sound made by striking together two flat surfaces, as in the body parts of humans or animals. Humans clap with the palms of their hands, often quickly and repeatedly to express appreciation or approval, but also in rhythm as a form of body percussion to match the sounds in music, dance, chants, hand games, and clapping games.

Applause is primarily a form of ovation or praise expressed by the act of clapping, or striking the palms of the hands together, in order to create noise. Audiences usually applaud after a performance, such as a musical concert, speech, or play, as a sign of enjoyment and approval.