The alt tag for images is a seo attribute that provides alternative text with a description to search robots and website visitors who cannot see the image

Alt tag for pictures – SEO WIKI

The alt tag for images is a seo attribute that helps drive traffic. Thanks to its presence in the HTML code, search engines receive information about photos and pictures posted on pages. While the robots did not recognize the graphics, the ranking of images in the results was largely determined by the alt-tags of the images, but even today their importance in the optimization and usability of the site cannot be underestimated.

Alternative text is important to visitors. For users whose images are disabled, the alt meta tag provides descriptions instead. Textual information is also displayed on the site of images that were not found on the server due to deletion, change of URL or incorrect path. A correctly composed alt seo attribute contains basic information about what a visitor should see.