A watermark may refer to any of the following:
1. A watermark is a logo or text superimposed on an image to help prevent an image from being copied or used without showing who owns the rights. The picture to the right shows an example of a watermark.
2. An image that has a fixed location and does not move along with other content. Watermarks are often used on web pages so that the site's logo or banner is always visible in the background.