What is the difference between kiteboarding and kitesurfing?

What do you call the sport of riding a board on water while being pulled by a kite? Are you a kiteboarder or a kitesurfer? What is the official name for the action sport?

It is one of the youngest boardsports in the world, and it was born in the early 1980s in France and Hawaii. Generally speaking, kiteboarding and kitesurfing are different names for the same water sport.

The majority of people tend to use them both interchangeably in conversations, although purists say they do not represent the same thing. So, why do we have two titles for one single outdoor activity?