A "tuplet" is a musical term that refers to a group of notes played in a specific way, often to create a unique rhythm. Tuplets allow musicians to fit a different number of notes into a single beat than what is typically expected. For example, a triplet consists of three notes played in the time usually taken by two. Tuplets can vary in number, such as triplets, quadruplets, or sextuplets, and are indicated in sheet music with a bracket or a number above the notes. They add complexity and interest to music, allowing for creative expression in compositions across various genres.