{Till some time back|Till few years back" no one bothered if your website was using SSL or not. Infact the term was not known to many and very few knew about the trusted seals offered by security companies. If you had an SSL certificate you were considered to be someone who was overly cautious about get more info securing website.
Things changed as Google released an update to Chrome in Feb 2018
Google Chrome and subsequently all the other browsers started tagging websites which were not using SSL as insecure.
Need to know why you need an SSL?