Eggs are a highly nutritious food composed of shell, egg white, and yolk. The main components are water, protein, and fat. Eggs are commonly graded A, B, C, or D based on interior and exterior quality. They come in various sizes from jumbo to peewee. Eggs can be cooked in many ways like hard boiled, soft boiled, poached, scrambled, baked, or fried. They are used as binders, leaveners, emulsifiers, and clarifying agents in cooking. Eggs should be refrigerated and used within 3 to 5 weeks of purchase.