An air pump is a device used to inflate or deflate objects by moving air in or out. It can be powered manually, like a foot pump, or electrically, such as a car tire pump. Air pumps are commonly used for inflating bicycles, sports balls, and air mattresses. These pumps work by creating a pressure difference, allowing air to flow into the item being inflated. Some air pumps come with pressure gauges to help users monitor the inflation level. They are essential tools for various activities, including recreational sports and household tasks.