An alt tag, also known as an alt attribute or alt text, is a piece of descriptive text that is added to the HTML code of an image on a website. The purpose of the alt tag is to provide a textual description of the image, in case the image cannot be displayed or if a user is using a screen reader to access the content. Alt tags are also used by search engines to understand the content of the image and improve its ranking in search results. Alt tags should be descriptive and relevant to the image, using keywords where appropriate, and should not be used for spammy or irrelevant purposes.
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While technical SEO and domain authority are both crucial components to a high-performing website, they're not enough. You need to reach the right audience with your content, and that's where relevance comes into play.