If an image does not have an Alt Tag, then a visually impaired user viewing the document will not know what the image is. The screen reader will read [BLANK].

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• An ALT TAG is read by screen readers in place of images allowing the content and function of the image to be accessible to those with visual or certain cognitive disabilities.  

• An ALT TAG is displayed in place of the image in browsers if the image file is not loaded or when the user has chosen not to view images.  

• An ALT TAG  provides a semantic meaning and description to images which can be read by search engines or be used to later determine the content of the image from page context alone.