In 2014 Google announced that HTTPS is a ranking signal for SEO. As the years have gone by, it has become even stronger. Having SSL enabled on your website is a must. SSL secures the communication between you and your customers, improves your SEO, and gives your site’s visitors the comfort that they are safe when browsing your website.
For various reasons, your SSL might get "turned off". This check will ensure your SSL is "always on". If it is not, you will be alerted.