Oocyte development refers to the process by which immature egg cells, or oocytes, mature into fully developed eggs ready for fertilization. This process occurs in the ovaries and involves several stages, including the growth of the oocyte and the formation of surrounding cells that support its development. During oocyte development, the oocyte undergoes meiosis, a type of cell division that reduces the chromosome number by half. This ensures that when fertilization occurs, the resulting zygote has the correct number of chromosomes. Proper oocyte development is crucial for female fertility and reproductive success.