Light soy sauce (also called thin soy sauce) is the most common soy sauce used in Thai cooking. This is not the same as low-sodium, but it has a light color and more delicate flavor than Japanese or Chinese soy sauces that many of us have in our pantries. Dark sweet soy sauce has a thicker texture and color and a more rich flavor. It is a must-have ingredient for the beloved Thai noodle dish, Pad See Ew. Check out my Guide to Essential Thai Ingredients for more details.