Salsa refers to a fusion of informal dance styles having roots in the Caribbean (especially in Cuba, Puerto Rico, and the United States), Latin and North America. The dance originated through the mixture of Mambo, Danzón, Guaguancó, Cuban Son, and other typical Cuban dance forms. Salsa is danced to Salsa music. There is a strong African influence in the music as well as the dance.
Salsa is usually a partner dance, although there are recognized solo steps and some forms are danced in groups of couples, with frequent exchanges of partner (Rueda de Casino). Improvisation and social dancing are important elements of Salsa but it appears as a performance dance too.
The name "Salsa" is the Spanish word for sauce, connoting (in American Spanish) a spicy flavor[1]. The Salsa aesthetic is more flirtatious and sensuous than its ancestor, Cuban Son. Salsa also suggests a "mixture" of ingredients, though this meaning is not found in most stories of the term's origin. (See Salsa music for more information)

Los Angeles style
L.A. style is danced on 1, in a slot. It is highly influenced by Hollywood and by the swing & mambo dances. L.A. style emphasizes sensuousness, theatricality, and acrobatics.
The two essential elements of this dance are the forward/backward basic as described above, and the cross-body lead. In this pattern, the leader steps forward on 1, steps to the right on 2-3 while turning 90 degrees counter-clockwise (facing to the left). The follower then steps forward on 5-6, and turns on 7-8, while the leader makes another 90 degrees counter-clockwise. After these 8 counts, the leader and follower have exchanged their positions.
Francisco Vazquez, along with his two brothers, Luis and Johnny, are often credited with developing the LA style of salsa. Francisco taught both of his brothers how to dance and all of them went on to become famous worldwide through their unique style of dancing. Francisco Vazquez, along with his brother Johnny, founded "Los Rumberos" Dance Company at the start of their career, which is still the leading dance company in Los Angeles. Luis Vazquez, along with then Joby Vazquez (now Joby Martinez) founded Salsa Brava Dance Company, which was another leading dance company in Los Angeles for many years.
Other people who also helped create L.A. Style as we know it are, Rogelio Moreno, Alex Da Silva, Joby Martinez, Rudy Zalez, Josie Neglia, Cristian Oviedo, Luis 'Zonik' Aguilar and many others. Tony Cordero and Robert Menache helped spread the influence of the LA style to Long Beach and Orange County.