Normalization is the process or methodology which is used to reorganizing no redundancy of data from the all data is stored in only one place and data dependencies are logical all related data items are stored together. Normalization is important for many reasons but chiefly because it allows databases to take up as little disk space as possible, resulting in increased performance. Normalization is typically a refinement process after the initial exercise of identifying the data objects that should be in the database, identifying their relationships, and defining the tables required and the columns within each table.