Receptor signaling is a field of research that focuses on the molecular mechanisms by which cells receive and process external signals from their environment. Receptors are proteins located on the cell membrane or inside the cell that bind specific molecules, such as hormones, neurotransmitters, or growth factors, leading to activation of signaling pathways within the cell. This activation triggers a series of molecular events that regulate various cellular processes, including cell growth, differentiation, and response to stimuli. Understanding receptor signaling is important for uncovering the underlying mechanisms of various diseases, such as cancer, diabetes, and neurological disorders, and for developing targeted therapies to treat these conditions.