What is the difference between a Coolant Overflow Tank and a radiator overflow bottle?

A coolant overflow tank and a radiator overflow bottle serve similar purposes but are distinct components. The coolant overflow tank is designed to collect excess coolant that expands from the radiator when the engine heats up, preventing pressure buildup. In contrast, the radiator overflow bottle typically refers to a specific type of tank that captures overflow from the radiator directly, allowing for the coolant to return to the system as it cools. Both components help maintain the proper coolant level, but they may be used in different cooling system designs.