Liquid coolers are cooling systems that use liquid, typically water or a coolant, to dissipate heat from computer components like the CPU and GPU. They consist of a pump, radiator, and water blocks that circulate the liquid, absorbing heat and transferring it away from the components. This method is often more efficient than traditional air cooling, allowing for better performance and quieter operation. These systems can be either closed-loop or open-loop. Closed-loop liquid coolers come pre-filled and sealed, making them easier to install and maintain. In contrast, open-loop systems allow for customization and upgrades but require more setup and regular maintenance. Liquid coolers are popular among gamers and PC enthusiasts for their effective cooling capabilities.