Mitosis and meiosis are both types of cell division that produce new cells, known as daughter cells, but there are some differences;
Mitosis produces two identical new cells with two sets (or pairs) of chromosomes that are identical to the original cell. The cells are genetically identical.
Meisos produces four gametes, or sex cells, by two divisions, and each new cell has only a single set of chromosomes. The cells are not genetically identical.
I find an easy way to remember the difference is to use an mnemonic, like:
Mitosis = Making Identical Two
Meosis = Making Eggs