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Salt (sodium chloride, NaCl) is a crystalline mineral compound extracted from sea water, salt deposits, or mineral springs. It occurs naturally in mineral form as halite and is one of the oldest and most essential seasonings in culinary history. Salt appears as colorless to white crystals with a cubic crystal structure, though varieties differ in grain size, mineral content, and processing method. Common varieties include sea salt (evaporated from seawater), kosher salt (larger crystals used in butchering), rock salt (mined from ancient deposits), and specialty salts such as Himalayan pink salt and Celtic grey salt, each with distinct mineral profiles and culinary applications.

Salt is characterized by a sharp, saline taste that enhances other flavors through osmotic and neurological mechanisms. Its hygroscopic properties allow it to draw out moisture from ingredients, making it valuable both as a seasoning and preservative. The mineral composition varies by source: sea salt contains trace minerals including magnesium, potassium, and calcium, while refined table salt is highly processed and typically contains anti-caking agents and iodine supplementation.

Salt serves as a fundamental seasoning across virtually all culinary traditions, enhancing natural flavors and balancing sweetness and acidity in dishes. It is essential in meat and fish curing, vegetable pickling, and bread fermentation, where it controls microbial activity and develops complex flavors. In cooking, salt is applied at multiple stages—during ingredient preparation, cooking, and finishing—to build layered seasoning. Different salt varieties suit different applications: kosher salt is preferred for dry brining and seasoning meats due to its larger crystals, sea salt adds mineral nuance to finishing dishes, and fine table salt dissolves quickly in liquids and baked goods. Salt also plays a critical technical role in transforming proteins, extracting myosin in meat to improve texture and binding in forcemeats and sausages.