Soy is a type of legume that comes from the soybean plant. It is a versatile food source, rich in protein and often used in various forms, such as tofu, soy milk, and edamame. Many people enjoy soy products as a plant-based alternative to meat and dairy, making it popular among vegetarians and vegans. In addition to its nutritional benefits, soy is also used in many processed foods and ingredients, like soy sauce and tempeh. It contains essential amino acids, making it a complete protein. However, some individuals may have allergies to soy, so it's important to be aware of its presence in food products.