Alternative text also known as Alt tags are used to describe an image in the context it has been used on a website. Alt tags help visually impaired visiting your website who have screen readers turned on. At times an image might fail to load for many reasons to mention here, however when that happens, the alt tag is then displayed on the web browser in place of the image as shown below.
That having been said, alt tags also help search engines to understand the context the image has been used in relation to the content on the web-page. This helps search engines understand when to show your content when a user is searching.
Now that we have discussed what alt tags are and the purpose they are meant to serve, let’s get down into understanding how you can create the best alt tags for your website.