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An egg is the reproductive body produced by female birds, particularly the domestic chicken (Gallus gallus domesticus), consisting of a hard or leathery shell encasing a nutrient-rich yolk and albumen (white). Chicken eggs are the most commonly consumed eggs in culinary contexts globally. The yolk is yellow to deep orange in color, containing fat-soluble vitamins and lipids, while the white is a translucent protein-rich liquid that coagulates with heat. Eggs vary in size, with standard large eggs weighing approximately 50 grams.

Eggs from other birds—including quail, duck, goose, and ostrich—offer different flavor profiles, nutritional compositions, and culinary properties. Duck eggs have a richer flavor and larger yolk-to-white ratio; quail eggs are miniature and prized in Asian and European cuisines; goose eggs are larger with a gamier taste.

Eggs function as a primary ingredient across virtually all culinary traditions, serving simultaneously as protein source, binder, emulsifier, leavening agent, and thickener. They are consumed alone in preparations such as fried, scrambled, poached, baked, or soft/hard-boiled eggs, and form the foundation of custards, meringues, mayonnaise, and hollandaise sauce. In baking, eggs provide structure and moisture to cakes, cookies, and pastries, while their lecithin content aids emulsification in sauces and dressings. Eggs are central to numerous dishes across cuisines: Spanish tortillas, Italian carbonara, French omelets, Chinese egg fried rice, and Japanese tamagoyaki (sweet rolled omelet).