By itself, an image is meaningless to a blind person because screen readers can only read text. To make your images accessible, you must add a text alternative. 

Please consider this example from Deque University:

When a screen reader comes to an image, it says "graphic," then reads the alternative text. An example would be "Graphic, An ancient cave painting in France showing two deer with antlers, plump bodies, and small legs. One deer appears to be fallen over or dead."

If you don't add alternative text to an image, a screen reader will not know what to say so it will either skip over the image, or read the image file name or link destination. It might say, for example, "Graphic, DSC800031.jpg."

The CMS WYSIWYG Editor requires you add an image description when you insert an image on your web page, and screen readers will use this description to help a blind person visualize your content. With this in mind, it is important that your image description be descriptive, concise, and accurate.

If you are working in HTML, you would add the alternative text to appear like this:

<img src="puppy.jpg" alt="A black puppy standing on an orange blanket looking up at hte camera." width="220" height="225" />
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