Why do you need alt text on your images?

Alt text (alternative text), also known as "alt attributes", “alt descriptions,” and technically incorrectly as "alt tags,” are used within an HTML code to describe the appearance and function of an image on a page.

Alt text uses:

1. Adding alternative text to photos is first and foremost a principle of web accessibility. Visually impaired users using screen readers will be read an alt attribute to better understand an on-page image.

2. Alt tags will be displayed in place of an image if an image file cannot be loaded.

3. Alt tags provide better image context/descriptions to search engine crawlers, helping them to index an image properly.
 
Alt tags are simply used for search engines. When search engines crawl your website they use the alt tags to better understand the content of your website so that they can properly index it within the ranks of their search results.
 
Search engines cannot read images directly on a webpage. Alt text is used with to define images in the source to help search engine spiders crawl and know about your webpage images. These tags are helpful to rank your images higher in search results.
 
The most important parts of Image SEO optimization are the image filename and the alt tag on your page. Properly optimizing images involves using the "Alt" attribute when adding images to your site. Basically Google Crawlers cannot read images, so you add the "Alt" attribute to tell these crawlers what it is.
 
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