An Inner Join is a type of database operation that combines rows from two or more tables based on a related column between them. It returns only the rows where there is a match in both tables, effectively filtering out any records that do not have corresponding entries. This is useful for retrieving related data from different sources, ensuring that only relevant information is displayed. For example, if you have a table of Customers and a table of Orders, an Inner Join can be used to find all customers who have placed orders. The result will include only those customers who have matching entries in the Orders table, providing a clear view of customer activity.