The term “watermark” dates back to paper production process, when initials, logo, or family heraldic was embedded into paper, visible when a sheet of paper is held to the light. In the digital photography world watermarks are images that are embedded into photographs, preventing unauthorized reproduction of images. Adding a watermark is the strongest protection against unauthorized use since watermarks cannot be easily removed without affecting the image. 

Rest assured:  watermarks will not appear on ordered prints - they are only used for online display images.