In order to illustrate the normalization process , let us consider one simple example. This is a single table database .
This table contains the information about the student , course enrolled by the student and the instructor details for each course.
This  table contains the data of three database entities. The three entities are , first the student, second the course enrolled, and the third entity is instructor.
The problem with this table is the multiple duplicate data. This table contains duplicate data ( redundant data ) in the multiple records.
For example, the course enrolled by each student and the instructor details are present in multiple records as redundant data.