A mango salsa is simply made with fresh chopped vegetables, primarily mangoes, red onions, and red peppers.  In this recipe demo, Deronda also squeezes lime juice on her freshly chopped mangoes to keep them from oxidizing.  This is a common technique with avocados.  This recipe makes a delicious dip as well as a topping for entrees.

Deronda has more nice recipe demo videos on her youtube channel, Foods101withDeronda.