Alt Text

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 website viewers the nature or contents of an image. The alt text appears in a blank box that would normally contain the image.
Using alt text on your images can make for a better user experience, but it may also help earn you both explicit and implicit SEO benefits. Along with implementing image title and file naming best practices, including alt text may also contribute to image SEO.
https://moz.com/learn/seo/alt-text

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