Soy sauce, originating in East Asia, is a dark, salty condiment made from fermented soybeans and other ingredients. It is widely used in Asian cuisine to add flavor and depth to dishes. There are three types of soy sauce: light, dark, and Tamari. Light sauce is lighter and saltier, while dark sauce has a deeper color and sweeter taste. Tamari is gluten-free and has a rich, full-bodied flavor. Soy sauce is typically stored in a cool, dark place and can be refrigerated.