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.

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. The alt text appears in a blank box that would normally contain the image.

Alt content (elective content) is a word or expression that can be embedded as a quality in a HTML (Hypertext Markup Language) archive to reveal to Web website watchers the nature or substance of a picture. The alt content shows up in a clear box that would ordinarily contain the picture.

Alt text -alternative text. It is a word or phrase that can be inserted as an attribute in an HTML document to tell Web site viewers the nature or contents of an image. The alt text appears in a blank box that would normally contain the image.

The alt attribute is the HTML attribute used in HTML and XHTML documents to specify alternative text that is to be rendered when the element to which it is applied cannot be rendered.

Alt tags giving context to what an image is displaying, that inform to search engine crawlers and allowing them to index an image correctly. it helpful to SEO