A centrosome is a cellular structure that serves as the main organizing center for microtubules. It plays a crucial role in cell division by facilitating the formation of the spindle apparatus, which separates chromosomes during mitosis. The centrosome is composed of a pair of centrioles surrounded by a proteinaceous matrix known as the pericentriolar material. It helps in maintaining cell shape and directing various intracellular processes. Abnormal centrosome function can lead to issues such as genetic instability and is linked to several diseases, including cancer.