DB Normalization in simple

This is one of the most frequently used question..lot times we know the thing have difficulty in expressing it...thot would write a simple post for it...

First Normal Form (1NF)

• Eliminate duplicative columns from the same table.
• Create separate tables for each group of related data and identify each row with a unique column or set of columns (the primary key).

Second Normal Form (2NF)

• Meet all the requirements of the first normal form.
• Remove subsets of data that apply to multiple rows of a table and place them in separate tables. Create relationships between these new tables and their predecessors through the use of foreign keys.

Third Normal Form (3NF)

• Meet all the requirements of the second normal form.
• Remove columns that are not dependent upon the primary key.

Fourth Normal Form (4NF)

• Meet all the requirements of the third normal form.
• A relation is in 4NF if it has no multi-valued dependencies.