Salsa is a latin american dance that emerged in cuba and puerto rico. It consists of a lot of hip movements, fluid transitions and intricate footwork. It is a very energetic Latin dance. Lots of fun, very popular in Latin clubs along with merengue.
Mambo is similar to Salsa (very fast!). The basic timing is quick-quick-slow. It is one of the Ballroom Rhythm competition dances, the others being Rumba, Cha-Cha, Bolero, and East Coast Swing