GAN (Gallium Nitride) technology is a type of semiconductor material that can be used to make power adapters more efficient. This is achieved by using a GAN-based power switch instead of a traditional silicon-based one, allowing for a higher switching frequency and lower power loss. The higher switching frequency enables the adapter to deliver more power while consuming less energy. Additionally, the lower power losses in GAN-based power switches reduce the amount of heat generated and make them more reliable than silicon-based ones.