A JOIN clause is used to combine rows from two or more tables, based on a related column between them.  MySQL supports four types of JOINS:

1. INNER JOIN: Returns records that have matching values in both tables
2. LEFT JOIN: Returns all records from the left table, and the matched records from the right table
3. RIGHT JOIN: Returns all records from the right table, and the matched records from the left table
4. CROSS JOIN: Returns all records from both tables
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