Sweet soy sauce, also known as kecap manis, is a thick, syrupy sauce that is commonly used in Indonesian and Malaysian cuisine. It has a sweeter taste than regular soy sauce and is often used as a marinade or glaze for meats. Regular soy sauce, on the other hand, is thinner and saltier and is used in a wide variety of dishes, from stir-fries to marinades to dipping sauces.