Rumba is a dance term with two quite different meanings.
In some contexts, "rumba" is used as shorthand for Afro-Cuban rumba, a group of dances related to the rumba genre of Afro-Cuban music. The most common Afro-Cuban rumba is the guaguancó. The other Afro-Cuban rumbas are Yambu and Columbia.
In other contexts, "rumba" refers to ballroom-rumba, one of the ballroom dance which occurs in social dance and in international competitions. In this sense, rumba is the slowest of the five competitive International Latin dances: the paso doble, the samba, the cha-cha-cha and the jive being the others. This ballroom rumba was derived from a Cuban rhythm and dance called the bolero-son; the international style was derived from studies of dance in Cuba in the pre-revolutionary period.

The Afro-Cuban rumba is entirely different from the ballroom rumba, both in rhythm and dance.