You can read about the importance of filling in alt images in the official guide from Google. In short, the alt tag is necessary in cases where the site user cannot see the picture; whether it is due to a screen reader or low internet speed, then he can read the alt of the image and understand the essence of the content.

It is also worth mentioning that alt tags help algorithms understand what is shown in the picture. For example, an online store owner may be interested in this, since determining the image’s subject will allow the product to participate in the ranking by images.



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