There are two types of Index:
1. Clustered Index: In the case of cluster index, each table can have only one cluster index. In the clustered index, the data is physically stored in the table in a specific order.
2. Nonclustered Index: The nonclustered index is just the opposite of the clustered index. In the non-clustered index, data is unsorted. The nonclustered index and the table data are stored at two different places.