Hooray Biology! :
Mitosis is a type of cellular reproduction where a cell will produce an identical replica of itself with the same number and patterns of genes and chromosomes.
Meiosis, on the other hand, is a special process in cellular division where cells are created containing gene patterns of different types and combinations with 50% of the number of chromosomes of the original cell.
Meiosis is used in sexual reproduction of organisms to combine male and female, through the spermazoa and egg, to create a new, singular biological organism. Mitosis is used by single celled organisms to reproduce, or in the organic growth of tissues, fibers, and membranes.