A kinetochore is a protein structure that forms on the centromere of a chromosome during cell division. It serves as the attachment point for spindle fibers, which are essential for moving chromosomes to opposite ends of the cell. This process ensures that each daughter cell receives the correct number of chromosomes. During mitosis and meiosis, the kinetochore plays a crucial role in chromosome segregation. It helps regulate the movement of chromosomes by interacting with the spindle apparatus, ensuring that chromosomes are accurately divided. Proper function of the kinetochore is vital for genetic stability in cells.