Alternative or Alt Tag

One thing you can be sure of on the web is that you never know exactly which browser and devices will be used to view the visitors of your page are likely to show up with mobile devices, screen readers for the visually impaired, browser that is running over very slow internet connections, cell phones...Who knows?

But in the middle of all this uncertainty, you can be prepared. Even if the browser can't display the images on your page, there is an alternative. You can give the visitor some indication of that information is in the image using element "alt" attribute.