NOTE: Do not connect two chargers to charge one device.
With phone manufacturers trying to save space to make phones smaller, they are reducing the number of ports on a phone to just one USB C port. This means that adapters have to be purchased in order to use accessories etc. The USB Type C to Type C adapter with Power Delivery (PD) has multiple functions when connected to your device.
A good example of this would be to listen to music from your phone/tablet with USB C headphones and charge at the same time.