This is one of the most popular social dances in New York nowadays, as there are plenty of Latin clubs, and plenty of great Latin dancers! The cutting edge of development for Salsa music is in NYC and Florida, both areas with large Latin communities.
Salsa works on the basis of Mambo - a pattern of six steps danced over eight counts of music. At this school, we call it Salsa if the pattern of steps begins on the "one" beat of the music, and Mambo if it starts on the "two" beat. Salsa is a more contemporary name for the same step pattern, and came about when dancers started mixing up Mambo with Hustle steps.