Differentiate between Physical Backups and Logical Backups.
Physical backups refer to the backups of the physical files used in storing and recovering databases, such as control files, data files, and archived redo logs. Eventually, every physical backup becomes a copy of files storing database details to some other location – on disk or some offline storage, such as tape.
And, Logical backups consist of logical data, such as stored procedures or tables, exported from a database with an Oracle export utility and stored in a binary file, to re-import later into a database through the concurrent Oracle import utility.
Lastly, physical backups form the basis of any sound backup and recovery strategy, whereas, logical backups supplements physical backups many a times but might not be sufficient to protect against data loss without physical backups.