The role of the gallbladder in digestion is to store and concentrate bile, a digestive fluid produced by the liver. When fatty foods enter the small intestine, the gallbladder releases bile through the cystic duct to aid in the emulsification and digestion of fats. This process enhances the absorption of fat-soluble vitamins and nutrients. The gallbladder's function is essential for efficient digestion and plays a critical role in maintaining overall metabolic health.