Molecular signaling refers to the process by which cells communicate with each other using chemical signals. These signals can be hormones, neurotransmitters, or other molecules that bind to specific receptors on target cells. This interaction triggers a series of biochemical events inside the cell, leading to a response such as growth, movement, or changes in metabolism. This signaling is crucial for maintaining homeostasis and coordinating various physiological functions in organisms. For example, in the nervous system, neurotransmitters like dopamine play a key role in transmitting signals between neurons, influencing mood and behavior. Understanding molecular signaling is essential for developing treatments for various diseases.