It is the process of removing redundancy(repeated data) by
splitting the tables into smaller tables.

Normalize the data from the  detabase.It reduces by the 
normalisation rule like(there are 4 normalization rule and 
BCNF)

Normalization is breaking the database into different 
tables and defining a relationship between them.
Objective is to isolate the data so that additions and 
deletions can be made in one table and propagated to other 
tables through relationships.

Normalization is the process of breaking  tables of a
database into smaller tables and defining relations between
them to make them more flexible, efficient and to remove the
modification anamolies from the database.

Normalization is the process of structuring relational 
database schema such that most ambiguity is removed. The 
stages of normalization are referred to as normal forms and 
progress from the least restrictive (First Normal Form) 
through the most restrictive (Fifth Normal Form).