What is a tag?
A tag is text that uniquely identifies a section of an image, and tags can ONLY be added to images. You can add tags to an entire image using regular tagging or to sections of an image using advanced tagging. Tags can be up to 50 characters long and cannot contain HTML or script tags.
Users can see the tags in an image when they move their mouse pointer over the full-size image. Tags entered using regular tagging are not “coordinate-based” and display regardless of where the mouse pointer is. Tags entered using advanced tagging are “coordinate-based” and only display as the mouse pointer moves over a specific section of the image.
You can:
See How do I add a tag for more information.