In a LEFT JOIN, all records from the left table are included, regardless of whether there is a match in the right table. If there is no match, NULL values are returned for the right table columns. In a RIGHT JOIN, all records from the right table are included, regardless of whether there is a match in the left table. If there is no match, NULL values are returned for the left table columns.

The difference lies in the order in which the tables are specified. LEFT JOIN considers the left table as the primary, while RIGHT JOIN considers the right table as the primary. So, the result sets differ based on which table you consider as the primary one.

LEFT JOIN returns all records from the left table and the matching records from the right table, while RIGHT JOIN returns all records from the right table and the matching records from the left table.