SSL Certificate
A digital certificate that encrypts data between a browser and a web server. Required for HTTPS. Websites without SSL are flagged as "Not Secure" by Chrome.
An SSL (Secure Sockets Layer) certificate is a digital certificate that authenticates a website’s identity and enables an encrypted HTTPS connection between the browser and the web server. Without SSL, data transmitted between the user and the site is sent in plain text and can be intercepted.
Google Chrome flags HTTP websites as “Not Secure,” and Google uses HTTPS as a ranking signal. Free SSL certificates are available through Let’s Encrypt and are included with most quality hosting providers. Sites handling payments or personal data have a legal obligation to use SSL.