Delete: By using Delete we can delete particular rows..through Where condition

eg.  delete from emp where age=10

Drop: if we want to delete the whole table...i.e...table structure,attributes,indexes..every thing we use drop

eg. drop table emp

Truncate:if we only want to get rid of the data inside the table and not the table itself we use truncate

eg.truncate table emp

DELETE Statement: This command deletes only the rows from the table based on the condition given in the where clause or deletes all the rows from the table if no condition is specified. But it does not free the space containing the table.

TRUNCATE statement: This command is used to delete all the rows from the table and free the space containing the table.

Delete : Delete is DML Command it mean once you delete the containts from table you can revert back.

Truncate: it is DDL command it mean once you delete the containts from the table you can't roll back.