The kinetochore is a protein structure that forms on the chromosome's centromere during cell division, specifically in mitosis and meiosis. It serves as the attachment point for spindle microtubules, facilitating the movement of chromosomes as they are pulled apart to opposite poles of the cell. The kinetochore plays a crucial role in ensuring accurate chromosome segregation, thereby preventing genetic errors in daughter cells. It also involves various proteins that help regulate the process of cell division.