Sensor data refers to information collected by sensors, which are devices that detect physical characteristics of the environment and convert them into electrical signals. This data can include measurements such as temperature, pressure, light intensity, motion, and more. Sensor data is used in various fields such as healthcare, smart cities, agriculture, and manufacturing to monitor and analyze changes in the environment, track movements, detect abnormalities, and make informed decisions. Researchers in this area work on developing and improving sensor technologies, designing algorithms for data analysis, and creating applications for real-time monitoring and control.