A gear pump is a type of positive displacement pump that uses gears to move fluids. It consists of two or more interlocking gears that create a vacuum to draw in liquid and then push it out through an outlet. Gear pumps are commonly used in various applications, including hydraulic systems and fuel transfer, due to their efficiency and ability to handle high-viscosity fluids. These pumps are known for their simple design and reliability. They can be categorized into two main types: external gear pumps, which have two gears rotating outside each other, and internal gear pumps, where one gear is inside another. Both types are widely used in industries such as automotive and manufacturing.