The process of dividing a cell nucleus into two nuclei is called mitosis. This is a fundamental process in cell division, allowing for the equal distribution of genetic material to two daughter cells. Mitosis is divided into several stages: prophase, metaphase, anaphase, and telophase, each playing a specific role in ensuring genetic fidelity. Mitosis is essential for growth, tissue repair, and asexual reproduction in organisms. Understanding mitosis is crucial in fields such as genetics, cell biology, and medicine, particularly in cancer research.