Remote sensing is the process of detecting and monitoring the physical characteristics of an area by measuring it's reflected and emitted radiation at a distance (typically from satellite or aircraft). Special cameras collect remotely sensed images, which help researchers "sense" things about the Earth.

All use sensors to monitor oil temperature and pressure, throttle and steering systems and so many more aspects. When you are at work, the lights may turn on using a motion sensor. Public toilet flushes often use a push-button or an infrared switch. You may also use a computer which uses many different sensors.