Wellheads are used in oil and gas extraction and production to control the flow of oil and gas from the reservoir to the surface. Other words used interchangeably with wellheads include Christmas trees, flow trees, and valves. These components are critical in ensuring the efficient and safe production of oil and gas. Christmas trees are often used to describe the above-ground components of the wellhead while flow trees refer to the system of control valves and chokes that regulate the flow of the fluids. Valves, also known as flanges, are the individual parts that help control pressure and flow. In summary, wellheads, Christmas trees, flow trees, and valves are all important components in the oil and gas industry.