What is the difference between a procedure and a function in PL/SQL? How do you declare a variable in PL/SQL? What is a PL/SQL block, and what are its components? What are cursors in PL/SQL, and what are the types of cursors? How do you declare an explicit cursor in PL/SQL? What are triggers in PL/SQL, and how do they work? How do you handle exceptions in PL/SQL?