Cholecystitis is the inflammation of the gallbladder, a small organ located beneath the liver. The gallbladder plays a crucial role in the digestive process by storing bile produced by the liver. Bile is released into the small intestine to aid in the digestion and absorption of fats. Cholecystitis typically occurs when there is a blockage in the cystic duct, which prevents the flow of bile out of the gallbladder.