Definition: Watermarks were originally faint imprints on paper that could only be seen at a specific angle. This process was designed to prevent counterfeiting and is still used today.
Today, digital watermarks are also added to photos, films and audio files to show a copyright by the owner of the object.
A watermark, in presentation software, is frequently used in a slightly different manner. A watermark is often a faded image or text used as a background of a slide. It is meant to enhance, but not be the focal point of the slide. Watermarks are sometimes used in the form of a logo, discreetly placed on a slide to brand the presentation.
