Nutritional yeast is a popular food product often used in vegan cooking. It gets it's name from the protein, vitamins, minerals and antioxidants it contains. Nutritional yeast comes in the form of either flakes or as a powder. It has a savoury, nutty and to the discerning palate, a cheesy flavour. People can add it as a savoury seasoning to a variety of dishes, including pasta, vegetables and salads. A popular vegan alternative for cheese sauce.
It's different from active dry yeast you use in baking, because it doesn't foam nor froth. Being inactive, it can't cause dough to ferment nor bread to rise.