You can add as many tags and create as many categories for your images as you need. This will allow you to view a particular group of images even if they are in different albums. There are 2 options to add tags and categories:

1. Go to Media library -> Click any image -> Right-hand column (Properties). Click the editing button next to Categories or Tags, then click “New”, enter the name of the new category/add a tag and click “Add”.
2. When you upload images to the media library, a pop-up window appears. You can write the tags for images in the “Set tags” field, separating them by commas. To create a new category, simply enter the name of the category into the field “Category name” and click “Add”.