Tofu skin is technically a byproduct of the tofu itself. During the tofu-making process, heated soy milk produces a thin layer of "skin" that forms on top of the milk.
Today, tofu skin is commonly eaten in many Asian cuisines and has been gaining traction elsewhere. There are a plethora of different types of tofu skins to choose from.
Tofu skin has a fatty texture that makes it a great meat substitute. Tofu skins, especially tofu sheets, are a great way to add a crunch to soups, salads, hot pots, and stir-fry.