Mitosis is the process of normal cell division where everything inside the mother is duplicated, then split to form two daughter cells. The mother cell essentially no longer exists.
This process goes on in your body millions times a day, and is the same process whereby bacteria and other single cell organisms divide.
Mitosis is distinct from meiosis where the number of chromosomes in each daughter cells (after the split) is exactly half that of the original mother cell. | 
