Multicellular organisms have cells which are more complex. When our cells divide its through a process called Mitosis. Your cells will undergo mitosis each time you cut yourself or damage your body, your cells will replicate to fix you. In fact, you started life off as just a single cell and now you are around 1 billion cells!
During Mitosis, a cell will make an identical copy of itself. Replicating all the organelles and internal structures. The cell which divides is called the mother cell, while the two new cells are called daughter cells. At the beginning the nucleus divides into 2, then the cytoplasm and by the end we have 2 identical cells.
Watch the video below, of mitosis in action.