Cellular signaling is the process by which cells communicate with each other to coordinate their functions. This communication often involves signaling molecules, such as hormones or neurotransmitters, which bind to specific receptors on target cells. This binding triggers a series of biochemical events inside the cell, leading to a response that can affect growth, metabolism, or other cellular activities. There are various types of cellular signaling, including autocrine, paracrine, and endocrine signaling. In autocrine signaling, a cell responds to signals it produces itself, while in paracrine signaling, signals affect nearby cells. Endocrine signaling involves hormones traveling through the bloodstream to reach distant target cells, allowing for widespread effects throughout the body.