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An egg is the reproductive body produced by avian species, most commonly the domestic chicken (Gallus gallus domesticus), consisting of a protein-rich white (albumen), a nutrient-dense yolk, and a protective calcium carbonate shell. Eggs vary in size, color, and composition depending on the bird species and breed; chicken eggs are the standard culinary ingredient globally, ranging from small (peewee) to extra-large grades. The yolk contains emulsifying compounds (lecithin) and fats, while the white is primarily albumin protein, making eggs chemically versatile for both sweet and savory applications.

Other culinary eggs include duck, goose, quail, and ostrich varieties, each with distinct flavor profiles and compositional differences. Egg color—whether white, brown, or blue-green shelled—is determined by breed genetics and does not affect nutritional content or culinary performance.

Eggs serve as a foundational ingredient across global cuisines, functioning as a binder, emulsifier, leavening agent, and thickener in addition to being prepared as standalone dishes. They are essential in baking and pastry work (meringues, sponges, custards), used in sauce production (hollandaise, mayonnaise, béarnaise), and feature prominently in breakfast preparations (fried, poached, scrambled, baked). Eggs also appear in pasta dough, quiches, soufflés, and as garnishes. Their emulsifying properties make them critical in binding forcemeats and preparing terrines, while their protein coagulation is exploited in clarifying stocks.