I believe that was only one variant, as different regions have their own variations on salsa.  Some of the more known styles are Cuban, Puerto Rican, Cali Colombia, L.A., and New York.
I love salsa dancing for exercise. It works up a sweat! Nice!  Salsa has it's origins in the Caribbean. It's a lot of fun. What else is interesting about it? The salsa's movements are derived from several other dances' forms, including Puerto Rican bomba and plena, Cuban Son, cha-cha-cha, mambo, and others! Very cool. So it's a mexture of all those? I don't exactly know.  Did you know that salsa actually originated in New York in the mid-1970's? Really? I'm surprised it originated in the U.S.
Different regions of Latin America and the United States have distinct salsa styles of their own, such as Cuban, Puerto Rican, Cali Colombia, L.A. and New York styles.