An egg white is . . .

An egg white is the white is the part of the egg that surrounds the yolk. It only turns white when cooked because of a chemical change. While the yolk is the primary source of nutrition in an egg, there is some nutrient content to the egg white. The technical name
for the egg white is the albumen.
Egg whites are the healthy part of the egg to eat. The yolk is where most of the cholesterol lies.
One egg contains about one tablespoon of egg yolk and two tablespoons of egg white.