Air vents are openings in a vehicle or building that allow air to flow through. They can be found on various types of vehicles, including cars and trucks, as well as buildings such as homes and offices. The purpose of these vents is to regulate the temperature inside by allowing fresh air to circulate and remove stale air. In a car, for example, air vents are used to direct cool or warm air from the heating and cooling system into the passenger compartment. They can also be adjusted to control the direction and speed of the air flow. Overall, air vents play an important role in maintaining comfort and providing fresh air inside a vehicle or building.