What is a join and explain different types of joins

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Joins are used in queries to explain how different tables are related. Joins also let you select
data from a table depending upon data from another table.
Types of joins: INNER JOINs, OUTER JOINs, CROSS JOINs,OUTER JOINs are further classified
as LEFT OUTER JOINS, RIGHT OUTER JOINS and FULL OUTER JOINS.