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An egg is the reproductive body produced by birds, particularly the domestic chicken (Gallus gallus domesticus), consisting of a protein-rich albumen (white), a lipid-rich yolk, and a protective calcified shell. Chicken eggs are the most widely consumed and commercially significant eggs in global cuisine, though eggs from quail, duck, goose, and ostrich are also used in cooking. The composition and size vary by species and breed, with standard large chicken eggs weighing approximately 50 grams. Eggs exhibit a neutral, slightly sweet flavor in the white and a richer, more savory taste in the yolk.

Beyond their role as standalone foods, eggs function as a crucial binding, leavening, and emulsifying agent in countless preparations. The cooking behavior of eggs is determined by their protein denaturation at specific temperatures: whites coagulate at 60–65°C (140–149°F), while yolks solidify at 65–71°C (149–160°F).

Eggs are among the most versatile culinary ingredients worldwide, employed in breakfast preparations (fried, scrambled, poached, baked), baking (cakes, pastries, custards), emulsified sauces (hollandaise, mayonnaise), and as binding agents in forcemeats and quenelles. They serve foundational roles in numerous cuisines: French patisserie relies on eggs for génoise and soufflés; Italian pasta dough traditionally incorporates egg yolks; Chinese cooking employs eggs in stir-fries and custard tarts; Spanish cuisine features eggs prominently in tortillas and flan. The technical properties of eggs—their ability to foam (meringues), thicken (custards), and bind (meatballs)—make them indispensable across both savory and sweet applications.

Preparation methods significantly alter texture and flavor delivery. Gentle heat produces creamy, delicate results, while higher temperatures yield firmer textures. Egg temperature before cooking affects cooking time and consistency; room-temperature eggs integrate more smoothly into batters and custards.