Sensors are devices that detect and respond to physical inputs such as light, temperature, motion, pressure, or humidity, converting them into electrical signals for monitoring or control. Widely used in automation, home security, healthcare devices, and smart appliances, sensors enable systems to react intelligently to their environment. Common types include temperature sensors, proximity sensors, and motion detectors, each designed for specific applications. Modern sensors are compact, low-power, and highly accurate, often integrated into IoT (Internet of Things) networks for real-time data collection. They enhance safety, efficiency, and convenience—for example, by triggering lights when someone enters a room or adjusting thermostats based on room temperature. Sensors are built to be durable and reliable, with many designed for long-term use in diverse conditions. Their role in smart homes, industrial automation, and environmental monitoring continues to expand, supporting innovation and energy conservation without requiring direct human intervention.