In PL/SQL, comments help readability by describing the purpose and function of code portions. Two types of comments are available in PL/SQL. They are as follows:
Single-line Comments: Single-line comments start with a double hyphen (- -) at the beginning of a line and go all the way to the conclusion.
Multi-line Comments: Multi-line comments start with a slash-asterisk (/*) and terminate with an asterisk-slash (*/), and they can span across several lines.