A SSL certificate is a set of encryption keys that once installed on a web server activates a secure connection between the browser the visitor is using and the web server for the website being visited. When installed, it activates the padlock and the https link protocol and allows secure connections from a server to a browser.
With the padlock in the browser address bar, the user can be confident a website is safe when providing details. In 2017, with Google’s push for a more secure and performant web, there is a search ranking boost for secure website. Google began officially warning website owners that non HTTPS sites would incur consumer messaging that identified the site as non-secure.