55 percent of websites don’t use alt text. You don’t want to be one of them. Why? Well, for one thing, alt text is a short description of the image used by screen readers to help visually impaired users understand what the image is.
This is a very good practice as it would describe the picture to someone who is visually impaired. People that are unable to see are still people and they deserve to be able to understand what is going on in the world around them.