Apple’s 30W USB-C Power Adapter may be used to charge and/or power iPhone, iPad, and Mac models that use a USB-C port or Lighting cable with a USB-C plug. Apple describes the adapter:
“The Apple 30W USB‑C Power Adapter offers fast, efficient charging at home, in the office, or on the go. While the power adapter is compatible with any USB‑C–enabled device, Apple recommends pairing it with the 13-inch MacBook Air with Retina display for optimal charging performance. You can also pair it with select iPhone and iPad Pro models to take advantage of the fast-charging feature.”
The charging cables are sold separately.