Salsa Cuban style can be danced either "On One" or "contratiempo". The latter is often referred to as "On Two".
An essential element is the "cuba step" (also known as Guapea), where the leader does a backward basic on 1-2-3 and a forward basic on 5-6-7. The follower does the same, thereby mirroring the leader's movement.
Another characteristic of this style is that in many patterns the leader and follower circle around each other.