Salsa is a partner dance. As in most other partner dances, there is a Lead and a Follow. Traditionally, the Lead is a man and the Follow is a woman, but this is not always the case.
Lead

Follow
This person will be moving according to the direction of the Lead.
She or he must be willing to be guided in order for this dance to look elegant.
The Follow must be able to detect slight pressure in the hands, arms, hips, etc. and know what each signal means.
It is also important for the Follow to develop good balance and flexibility.
Follow will start with right foot on first beat.

It is important to know how to stand with your partner before you begin dancing. In salsa there are two positions: open and closed.