Secure Socket Layer can be shortened to SSL.
When a web browser contacts your secured website, the SSL certificate enables an encrypted connection. It’s kind of like sealing a letter in an envelope before sending it through the mail.
Without SSL encryption any computer could intercept the transmission from your browser to the server.
This includes the transmission of credit card numbers, usernames and passwords, and other sensitive information.
29% of Building Product websites were not secured with an SSL certificate – (The State of Building Product Digital Marketing, 2019)