The image shows a custom-built gaming PC with a water-cooling system. The water-cooling system is made of a reservoir, a pump, and a radiator. The reservoir is filled with water and the pump circulates the water through the radiator. The radiator is cooled by fans, which dissipate the heat from the water. The water-cooling system is designed to keep the PC cool during operation. The PC also has a number of RGB lights, which can be controlled using software. The lights can be used to create a variety of different effects.