When you set up an SSL certificate, you configure it to transmit data using HTTPS. The two technologies go hand in hand and you can’t use one without the other.
URLs are preceded with either HTTP (Hypertext Transfer Protocol) or HTTPS (Hypertext Transfer Protocol Secure). This is effectively what determines how any data that you send and receive is transmitted.
This means that another way to identify whether a site uses an SSL certificate is to look at the URL and to see whether it contains HTTP or HTTPS. That’s because HTTPS connections require an SSL certificate to work.
Chrome Indicates if a Website Uses SSL/TLS
Most of the major browsers including Google Chrome, Firefox and Microsoft’s Edge will prominently display when users are accessing a site through a secure connection. In Chrome, for example, you’ll see a green padlock icon in the address bar alongside a message saying “secure”. Users can view more details about the SSL certificate by clicking on it.
Furthermore, since the introduction of Chrome 68 in July 2018, websites without an SSL/TLS certificate display a “not secure” warning
Because browsers are going out of their way to actively display whether sites are secure, it’s in your best interests as a website owner to take the hint and to secure your site. That way, visitors can instantly see that your site is reliable as soon as they visit it.