Mitosis is the process of nuclear division in eukaryotic cells. It is divided into four main stages: prophase, metaphase, anaphase and telophase. During prophase, the nuclear envelope and nucleolus disappear. In metaphase, chromosomes align along the metaphase plate. In anaphase, chromatids separate and move towards opposite poles. Finally, in telophase, nuclear envelopes form around the separated chromosomes and cytokinesis occurs to divide the cytoplasm. Mitosis plays an important role in growth, development, and repair of multicellular organisms.