Action cameras are small, light video cameras that are commonly used to capture footage in situations where the camera operator has to have his hands free for the task at hand such as skiing, snowboarding, or surfing.
It's important that the action camera be durable and waterproof so that it can withstand bumps, hits, rain and occasional falling in the nearby puddle. It has to be compatible with a wide variety of mounts so that it can be strapped to snowboards, rollbars and helmets. It needs to have a good wide-angle lense so that it can capture all importan action without needing to be adjusted midway through. And a good action camera will also be capable of capturing high framerate video and offer a variety of resolutions.