Skin diving is a popular recreational activity that requires specialized gear. The three main pieces of equipment for a skin diver are a MASK, scuba, and snorkel. A MASK is a face covering with a clear window that allows the diver to see underwater. Scuba stands for self-contained underwater breathing apparatus and is a device that provides air to the diver while underwater. Finally, a snorkel is a tube that allows the diver to breathe while their face is submerged in the water. All of these items are essential for a successful skin diving experience.