A sensor detects changes or variations in a physical or chemical environment. They help in measuring, monitoring, and controlling different parameters, ensuring optimal conditions for various processes. Sensors are used in various fields, including manufacturing, healthcare, agriculture, transportation, and environmental monitoring. They play a crucial role in ensuring safety, efficiency, and accuracy in different applications.

Here are some of the common purposes for which sensors are employed: To Detect - Sensors help in detecting the presence of a specific substance, gas, or object. They are used in monitoring systems, industrial automation, and security systems to detect hazards or unauthorized activities. For example, sensors are used in carbon monoxide detectors to alert people of the presence of harmful gases in their homes or workplaces. To Measure - Sensors help in measuring physical quantities such as temperature, pressure, humidity, light, sound, and motion. They are used in thermometers, barometers, hygrometers, and accelerometers to measure various parameters accurately. These measurements help in controlling processes, optimizing performance, and ensuring quality control in various systems. To Identify - Sensors help in identifying the identity, location, or condition of an object or system. They are used in barcode scanners, RFID tags, and QR code readers to identify products or assets. These identification systems help in streamlining inventory management, tracking shipments, and enhancing security in various industries.