Cellular interactions refer to the ways in which cells communicate and work together within an organism. These interactions can occur through direct contact, such as when cells bind to each other, or through signaling molecules that are released into the surrounding environment. This communication is essential for processes like growth, immune responses, and tissue repair. Different types of cells, such as neurons and immune cells, utilize various mechanisms to interact. For example, neurons transmit signals through neurotransmitters, while immune cells use cytokines to coordinate responses to infections. Understanding these interactions is crucial for advancing medical research and therapies.