Astrocytes are star-shaped cells in the brain and spinal cord that play a crucial role in supporting neurons, the cells responsible for transmitting signals in the nervous system. They help maintain the balance of chemicals, provide nutrients, and remove waste products, ensuring that neurons function properly. Astrocytes also contribute to the blood-brain barrier, which protects the brain from harmful substances. In addition to their supportive functions, astrocytes are involved in communication within the brain. They can release signaling molecules that influence neuronal activity and help in the repair process after injury. Their diverse roles make astrocytes essential for overall brain health and function.