Sensor sensitivity refers to the ability of a sensor to detect small changes in the environment or the quantity it is measuring. A highly sensitive sensor can pick up even minor variations, making it useful in applications like medical devices or environmental monitoring. In contrast, a sensor with low sensitivity may only respond to significant changes, which can limit its effectiveness in precise measurements. Sensitivity is often quantified in terms of the smallest detectable signal, and it plays a crucial role in determining the overall performance of devices such as cameras and temperature sensors.