Are you developing USB-Power Delivery IP/VIP?
In that case, does going through the spec every now and then seems tedious? The naswer to your prayers is here! This USB-Power Delivery Cheat Sheet provides a simplified view of the important aspects of the USB PD spec.
USB-Power Delivery is an enhanced power delivery protocol provided on top of the USB protocol. It allows more flexible power exchange over a single cable. Gone are the days when one needed a power socket to charge electronic devices or had to carry an adapter.
USB-PD makes power delivery simple and flexible. With USB-Power Delivery supported cables, you can make your mobile phone a power source and charge a laptop or another mobile phone.