An emulsion is defined by combining two liquids that will maintain their distinct characteristics after being mixed. When talking about emulsions as applicable in a kitchen, the term emulsion refers to combining fat and water. Culinary emulsion can take two different forms; fat dispersed into water and water dispersed into fat. Common fat in water emulsifications include hollandaise, mayonnaise, aioli, milk, cream, and pan sauces. Water in fat emulsifications are most commonly found in the form of vinaigrettes and whole butter.