What is PD (Power Delivery) fast charging?

USB Power Delivery is a fast charging standard that delivers up to 100W+ through USB C cables. A 20W PD charger charges an iPhone from 0 50% in about 30 minutes. Without PD, the same charge takes 60 90 minutes. Both your power bank AND your phone must support PD for fast charging to work. Look for "PD" or "Power Delivery" and a wattage rating (18W, 20W, 45W, 65W, etc.).