A diaphragm pump is a type of positive displacement pump that uses a flexible diaphragm to move fluids. The diaphragm alternates between two chambers, creating a vacuum that draws fluid in and then pushes it out. This design allows for efficient handling of various liquids, including those that are viscous or contain solids. These pumps are commonly used in industries such as chemical processing, water treatment, and food and beverage. They are known for their ability to handle corrosive and abrasive materials while providing a leak-free operation, making them a reliable choice for many applications.