When you upload or add an image to your library, you have the option to “tag” the image with a certain keyword by right-clicking on the image and selecting “Tag”.
Tags are descriptive words that will help you find your image when performing a search. i.e. if your image is a kitten, you can tag it “kitten, cute, animals”.
If you tag a group of photos all as “kitten” for example, you can enter “kitten” into the search field in the My Images tab and click the down arrow to select “Search My Gliffy Account”. This will then pull up any images you have tagged with that word.
If you want to know the specific properties or tags related to an image, right-click on it and select “Get Image Info”.