Sound sensors are devices that detect and respond to sound waves in the environment. They convert sound energy into electrical signals, allowing them to measure sound levels or recognize specific sounds. Common applications include smartphones, security systems, and voice-activated assistants. These sensors can vary in complexity, from simple microphones that pick up sound to advanced systems that can differentiate between various sound frequencies. They are widely used in fields such as automotive technology, home automation, and industrial monitoring to enhance functionality and improve user experience.