Skin conductance refers to the electrical conductance of the skin, which changes in response to sweat gland activity. This phenomenon is often measured using a device called a galvanometer, which detects variations in skin resistance. Increased sweat production, often triggered by emotional or physiological responses, leads to higher conductance levels. Skin conductance is commonly used in psychophysiology to study emotional arousal and stress responses. It can provide insights into how individuals react to stimuli, making it valuable in fields like lie detection, market research, and clinical psychology.