Oxygen sensors are devices used to measure the amount of oxygen in gases or liquids. They are commonly found in vehicles, where they help monitor the air-fuel mixture in the engine. By providing feedback to the engine control unit, oxygen sensors ensure optimal combustion, improving fuel efficiency and reducing harmful emissions. In addition to automotive applications, oxygen sensors are also used in various industrial processes and environmental monitoring. They can help track air quality and ensure safety in confined spaces. Overall, these sensors play a crucial role in maintaining efficient and clean operations in multiple fields.