=> In a clustered index, the leaf level pages are the actual data pages of the table. When a clustered index is created on a table, the data pages are arranged accordingly based on the clustered index key. There can only be one Clustered index on a table.
=> In a Non-Clustered index, the leaf level pages does not contain data pages instread it contains pointers to the data pages. There can multiple non-clustered indexes on a single table.