Valves are mechanical devices that control the flow of fluids, such as liquids and gases, within a system. They can open, close, or partially obstruct pathways, allowing for precise regulation of pressure and flow rate. Common types of valves include gate valves, ball valves, and check valves, each serving specific functions in various applications. Valves are widely used in industries like plumbing, oil and gas, and manufacturing. They help ensure safety and efficiency by preventing backflow, managing pressure, and directing fluid movement. Proper valve selection and maintenance are crucial for the reliable operation of any fluid system.