USB-C Power Delivery

USB-Power Delivery (PD) is a fast-charging technology based on the USB-C standard. Certain Apple® and Android smartphones/tablets and various laptop brands support the technology, which provides much higher performance than standard charging methods.
 
USB-C PD is a new standard that can deliver up to 100 watts of power, which is enough to charge laptops and other devices that require more power than USB-C alone can supply. This specification was created by the USB-IF in response to requests from laptop manufacturers for a connector that could deliver more power.

USB-C PD is a power delivery spec that can provide up to 100W of power, which means that you can plug in a laptop and charge it. This is especially useful if the battery is dead and you need to get some work done. You also don't have to worry about the charger breaking or losing your charger because USB-C PD will work with any charger. USB-PD can charge smartphones/tablets up to 70% faster than a standard USB charger with 5 watts of power. This means that it does not take as long for the device to charge up to 100%.

It is an open standard, so you don't have to worry about proprietary chargers.

USB-C PD can supply a greater amount of power than standard wall chargers, so it is especially useful for getting power back into devices fast. USB-PD can charge smartphones/tablets up to 70% faster than a standard USB charger that only offers 5 watts of power. Plus, since USB Power Delivery is an open widely adopted standard, more chargers are using the technology.

This flexibility means you won't have to worry as much about losing, breaking or not having your specific/proprietary charger because more chargers will work with your USB-C PD device.  

Yes. The USB Power Delivery chipset always delivers exactly the right amount of power. Whether it's a smartphone or a laptop, the charger recognizes the connected device and negotiates the required power to charge it as quickly as possible. This negotiation ensures a quick charge without delivering too much power or damaging the devices circuits.

There is no need to be. There are three iterations of the USB PD standard. USB PD 1.0 is a rather basic version providing fixed power profiles, whereas the newer PD 2.0 and 3.0 revisions are more dynamic and provide greater flexibility.

Here is a brief overview of the power requirement of different types of devices.