SSL/TLS Certificates are digital certificates that provide a secure connection between a web server and a browser. They encrypt data transmitted over the internet, ensuring that sensitive information, like passwords and credit card numbers, remains private and protected from eavesdroppers. These certificates are issued by trusted entities known as Certificate Authorities (CAs). When a website has an SSL/TLS Certificate, users can see a padlock icon in the browser's address bar, indicating that the connection is secure. This helps build trust between users and websites, encouraging safe online transactions.