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@@ -674,3 +674,7 @@ There are different types of joins available in SQL −
       
 # SQL - Indexes ✌
 
+- Indexes are special lookup tables that the database search engine can use to speed up data retrieval. 
+- Simply put, an index is a pointer to data in a table. 
+- An index in a database is very similar to an index in the back of a book.
+