This is important because it is not very professional to see an image on a site that is broken, this can put users off from visiting your site. Broken images are an annoyance for the visitor and reflect badly on the content provider. If a link does not report a status code of 200 and the link to the image is broken and is not responding it will be reported as an error.
Broken images, like bad links, can cause you to lose clients and customers
Broken images cause frustration and irritation — if clients and customers are trying to access information they bookmarked, a digital product they purchased, or an article that someone linked to on Twitter, and the links don’t work, their trust in you and your brand will diminish
Broken images will hurt your conversion rates — after all, if a purchase link doesn’t work, the purchase won’t be made
If links to a sales page for a new product, program, or service you’re using in your marketing don’t work, not many people will be able to sign up
Usability & SEO
This checkpoint looks at an <img> tag and checks the href link, performing a check to see if the link lead to a broken page. If so then this will be reported as an error. Broken links are identified based on the link's HTTP response codes.