A dry cooler is a type of heat exchanger that uses ambient air to cool a fluid, typically water or glycol, without direct contact between the fluid and the air. It relies on convection and conduction to transfer heat from the fluid to the air, which is then expelled into the atmosphere. Dry coolers are commonly used in various applications, including industrial processes, HVAC systems, and power generation, where they serve as a cost-effective and water-efficient cooling solution.