Alt text (alternative text) is a word or phrase that can be inserted as an attribute in an HTML (Hypertext Markup Language) document to tell Web site viewers the nature or contents of an image on their screen.
Alt text is a description of the image.
The alt attribute is used by a ‘screen reader’ software so that a person who is listening to the content of a webpage (for instance, a person who is visually impaired or blind) can interact with this element.
The person can build up an image from the alternative text within the image. Read out by their screen reader.
I have now put alt text into the images on my posts on this website. As well as descriptive links.
One Vision Blog 