External gear pumps are mechanical devices used to move fluids by using two interlocking gears. As the gears rotate, they create a vacuum that draws fluid into the pump and then pushes it out through an outlet. These pumps are commonly used in various applications, including hydraulic systems and lubrication systems, due to their efficiency and reliability. The design of external gear pumps allows for a consistent flow rate, making them suitable for handling different types of fluids, including oils and chemicals. They are often preferred in industrial settings because they can operate at high pressures and are relatively easy to maintain compared to other pump types.