SSL stands for Secure Sockets Layer and is a cybersecurity protocol that digitally encrypts information sent from a browser to a server. SSL certificates are used to protect sensitive information such as credit card numbers, usernames, passwords, email addresses, and more. A website with an SSL certificate is identified by a set of trust indicators such as "https" and the padlock icon in the browser bar, a website seal from a reputable certificate authority (CA), and a green bar surrounding the URL more premium certificates.