Originally known as the Cha-Cha-Cha. Became popular about 1954. Cha Cha is an offshoot of the Mambo. In the slow Mambo tempo, there was a distinct sound in the music that people began dancing to, calling the step the "Triple" Mambo. Eventually it evolved into a separate dance, known today as the Cha Cha.
The dance consists of three quick steps (triple step or cha cha cha) and two slower steps on the one beat and two beat.

來源：網絡