A hand pump is a simple mechanical device used to move liquids or gases from one place to another. It operates by creating a vacuum or pressure through manual effort, typically using a handle that the user pumps up and down. Hand pumps are commonly used for tasks like drawing water from a well or transferring fuel. These pumps come in various designs, including piston pumps and diaphragm pumps, each suited for different applications. Hand pumps are valued for their portability and ease of use, making them ideal for situations where electricity is not available or when a quick solution is needed.