DBMS Normalization is a technique for designing relational database tables.
Tables can be normalized to varying extents. Database theory describes a table's degree of normalization in terms of normal forms of successively higher degrees of strictness.
A table in third normal form (3NF), for example, is consequently in second normal form (2NF) as well; but the reverse is not always the case.
More highly normalized tables reduce data duplication and opportunities for various kinds of logical inconsistencies that could lead to loss of integrity of the database.