Motion detection is a technology that allows devices to sense movement in their surroundings. It is commonly used in security systems, where cameras or alarms activate when they detect motion. This helps to keep homes and businesses safe by alerting owners to potential intruders or unusual activity. The process typically involves sensors that can pick up changes in light, heat, or sound. For example, infrared sensors can detect body heat, while video cameras can analyze changes in the visual field. By using these technologies, motion detection systems can provide real-time alerts and enhance overall security.