Secure Sockets Layer

US /sɪˌkjʊr ˈsɑːkɪts ˈleɪər/
UK /sɪˌkjʊr ˈsɑːkɪts ˈleɪər/
"Secure Sockets Layer" picture
1.

a standard security technology for establishing an encrypted link between a web server and a browser, ensuring that all data passed between them remains private and integral

:
Websites using Secure Sockets Layer display a padlock icon in the browser.
Many online transactions are protected by Secure Sockets Layer encryption.