It’s an HTML attribute of the IMG tag. The IMG tag is responsible for displaying images. The alt tag/attribute is the text that gets displayed in case the image can’t be loaded (if the file is missing, for example).
To give you an example, here’s what a standard IMG tag could look like:
<img src=”taylormade-golf-ball.jpg” alt=”Taylormade Golf Ball” />
Alt tags have some SEO value. The thing is that Google can’t (at least at the moment) see what the actual image presents, but it can read the alt tag. There’s no better way of informing Google what’s on your images than by using alt tags.
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