Alt text is part of your image tag — when you mouse over an image with your cursor, the alt text is displayed. Alt text is also used for disabled users browsing with special speech or text-only browsers.
Alt text can be very important for search engine optimization if you use an image to display text on your website. Because the text displayed within the graphic is not recognized by a search engine's crawler, the information within it cannot be indexed, which is counter-productive to your site's ranking in that search engine's query results. Attributing alt text to that image allows the crawler to index the information and relate it to the image.
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