What is an Alt Tag?
It is an HTML attribute added to image tags to provide search engines with a text substitute, great for visually impaired users.
Optimising SEO
By adding additional relevant signals to a web page, Alt text will help boost the SEO efficiency of your site and help Google better understand the contents of an image and help it rank.
Key point: Using your keywords, Alt tags gives you another chance to have your target keyword on a website, and therefore letting search engines know that your page is highly important to a specific search query.