Skimboarding (or skimming) is a boardsport in which a skimboard (much like a surfboard but smaller and without fins) is used to glide across the water's surface to meet an incoming breaking wave, and ride it back to shore.
Unlike surfing, skimboarding begins on the beach by dropping the board onto the thin wash of previous waves. Skimboarders use their momentum to skim out to breaking waves, which they then catch back into shore in a manner similar to surfing.
Skimboarding originated in Southern California when Laguna Beach lifeguards wanted to surf the local shore breaks that were too fast and shallow for surfboards.
In 2015, I took a part in the Ocean Spirit competition in Santa Cruz / Portugal. I had a really great time there and I met many skimboarders from all over the world.