Watermarking in Photoshop is a process of adding text or graphics to images to identify them as being part of a particular document or series. There are a variety of ways to do this, but the most common way is to use the watermark tool. To use the watermark tool, first open Photoshop and click on the File menu and then select New File. In the new file dialog, select Image from the list and then click on the OK button. Next, open your image file and click on the Edit button. In the Edit panel, select Watermark from the list and then click on the OK button. Now that you have created a new watermark, you can use it by clicking on it in an image and then selecting View > Watermark > Add Watermark. This will add the watermark to your image in just a few seconds.