Http / https

Hyper Text Transfer Protocol Secure (HTTPS) is the secure version of HTTP, the protocol over which data is sent between your browser and the website that you are connected to. The 'S' at the end of HTTPS stands for 'Secure'. It means all communications between your browser and the website are encrypted.

Also, if there is no 'S', then there is no certificate. The use of an SSL certificate (SSL stands for secure sockets layer) creates a secure encrypted connection between the web server and the web browser.