What are egg whites?

Egg whites are the clear, viscous liquid that surrounds the yolk of an egg. They are composed of about 90% water, 10% protein, and trace amounts of other nutrients such as vitamins and minerals. Egg whites are a good source of protein and are often used in baking and cooking. They can also be used as a base for foams, such as meringue, and as a binding agent in recipes. Egg whites are also used in some cosmetic and pharmaceutical applications.