Cell signaling is the process by which cells communicate with each other to coordinate their activities. This communication is essential for many functions, such as growth, immune responses, and maintaining homeostasis. Cells send and receive signals through molecules like hormones and neurotransmitters, which bind to specific receptors on target cells, triggering a response. When a signal binds to a receptor, it can initiate a cascade of events inside the cell, often involving proteins and other molecules. This process allows cells to respond to changes in their environment, ensuring that organisms can adapt and function properly. Examples of cell signaling include the action of insulin in regulating blood sugar levels and neurotransmitters transmitting signals in the nervous system.