Choledochojejunostomy is a surgical procedure that involves creating an anastomosis (connection) between the common bile duct and the jejunum, which is part of the small intestine. This procedure is typically performed to bypass obstructions in the bile duct, such as those caused by tumors, stones, or strictures, allowing bile to flow directly into the intestine for digestion. It is often indicated in cases of chronic bile duct obstruction or after the removal of the gallbladder. The operation helps alleviate symptoms such as jaundice and biliary colic.