Glial cells are essential support cells in the nervous system, playing a crucial role in maintaining the health and function of neurons. Unlike neurons, which transmit signals, glial cells provide structural support, nourishment, and protection. They help create a stable environment for neurons to thrive and communicate effectively. There are several types of glial cells, including astrocytes, microglia, and oligodendrocytes. Astrocytes help regulate blood flow and maintain the blood-brain barrier, while microglia act as the immune cells of the brain, cleaning up debris. Oligodendrocytes are responsible for forming the myelin sheath that insulates neurons, ensuring efficient signal transmission.