Gultin, often referred to as gluten, is a protein found in wheat and related grains such as barley and rye. It gives dough its elasticity and helps it rise and maintain its shape, making it essential in baking. Some individuals have gluten intolerance or celiac disease, which requires them to avoid gluten-containing foods. Gluten can also be found in various processed foods, making it important to read labels for those with dietary restrictions.