Manual pumps are devices used to move liquids or gases from one place to another without the need for electricity. They operate by using human effort, typically through a handle or lever, to create suction or pressure. Common examples include hand water pumps and bicycle tire pumps. These pumps are often portable and easy to use, making them ideal for situations where power sources are unavailable. Manual pumps are commonly found in outdoor settings, such as camping or gardening, and are also used in various industries for tasks like transferring fluids or inflating objects.