Normal cells ...
Normal cells in our body usually stop reproducing after a certain period of time, usually when their function isn't necessary anymore.
There are some cells in our body that will always be necessary sonthat they never stop reproducing, for example,blood and skin cells.
Cancer cells...
What happens in cancer cells is that they never stop growing because they don't have receptors to receive the message of " stop growing ", causing tumors to grow in our body.
What happens...
Cancer cells can't make the DNA repair process so this leads to more problems during reproduction of the cancer cells.