There are many different Normalization forms in RDBMS . Below are some of the most commonly used ones.
1. 1NF (1st Normal Form)
2. 2NF (2nd Normal Form)
3. 3NF (3rd Normal Form)
4. BCNF ( Boyce-Codd Normal Form)
5. ONF ( Optimal Normal Form)
6. 4NF ( 4th Normal Form)