A Venturi pump is a device that uses the principle of fluid dynamics to create a vacuum or move fluids. It operates by forcing a liquid through a narrow section of pipe, known as the Venturi effect, which causes a drop in pressure. This pressure drop can draw in another fluid or gas, allowing the pump to transfer or mix substances without the need for mechanical parts. These pumps are commonly used in various applications, including aquarium systems, chemical processing, and water treatment. They are valued for their simplicity, reliability, and ability to handle different types of fluids, making them an efficient choice for many industries.