We explained what the ALT tag is in a prior post. At this point, we simply want to reinforce the value of the ALT tag from an SEO standpoint.
In a February 2008 post on his popular SEObook blog, SEO expert Aaron Wall shared an anecdote proving the value of creating an ALT tag for images from the standpoint of search engine optimization. Other SEO experts concur, stressing that if your image is hyperlinked (i.e., the image is clickable), then the ALT attribute provides value in the same manner as does the "anchor text" in a text link.
Google itself stresses the importance of descriptive ALT tags for images in its webmaster guidelines.
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