What are emulsions? What are their different types?

What are emulsions? What are their different types? Give one example of each type.

Liquid-liquid colloidal system in which finely divided
droplets of a liquid are dispersed into other liquid are called
emulsions.
Emulsions are of two types:
(i) Oil in water, e.g. milk.
(ii) Water in oil, e.g. butter.