Capacitive touch sensors are sensors that can detect contact through electrical changes in an electrical field. They work by sensing the small changes in capacitance caused by the presence of an object near the sensor. The object could be a finger, a stylus, or any other conductive object. Capacitive touch sensors can be used in a variety of applications, including touch screen displays, industrial control systems, and medical equipment. They are especially popular because they are simple to use and require little to no maintenance.