Natural convection is a reliable, low noise, low vibration form of air cooling, relying on buoyancy to drive air flow instead of a fan or pump. Like conduction, since natural convection doesn't rely on a mechanical system to drive flow, its size differs than that of forced air and liquid cold components, and can be more compact.
A popular choice to cool consumer electronics and telecommunication equipment, natural convection cooling components operate best in outdoor settings.
Natural convection cooling is used in situations where reliability, noise and size are critical. For instance in cell phones, GPUs, semiconductors, telecommunication equipment and LEDs.