The traditional ceremonial dance at a quinceañera is called a vals.
Vals is the Spanish word for waltz, a partnered dance in triple meter that became fashionable in European courts and later spread widely through the Americas. At a quinceañera, the celebrant often performs a choreographed vals with her court, relatives, or another chosen partner.
The dance can symbolize a public transition into a new stage of life, but there is no single choreography used by every family. Some celebrations include a formal waltz, while others replace it with contemporary dances, themed routines, or a mixture of styles.
A quinceañera vals should not be confused with salsa or merengue, which are also popular at Latin American parties. Those genres may appear later in the reception, but vals is the conventional name for the ceremonial waltz.