What is the type C PD function?
USB Tpye-C is USB interface standard "USB Type-C", USB PD is "USB Power Delivery Specification (USB PD)" power supply specifications.
Which USB PD2.0 power supply specifications is USB Type-c interface to support an important standard.
TYPE-C and USB PD2.0, will fundamentally solve the electronic product power supply confusion (inconsistent) situation.
The image is that the adapter is made of a product, with electrical appliances through the USB Type-C interface to inform the adapter output current voltage required.
Thus achieving a unified / universal charger and charging / communication interface.