When you access a database system and open a database table you get a nice formatted data inform for table. But this is not how the data is actually stored in database. Thanks to developer who has hidden the complexity of implementation and gave us a nice and easier view. Hence, the data can be viewed at various level as follows:
Physical Level: How the data is actually stored in the system Programmers take care of it.
Logical Level: How the data is logically connected and what relationship exist among them. Database designers take care of it.
View Level: It simplifies the user’s interaction with the system. Only a part of whole database is presented to the user.