Secure Sockets Layer (SSL) is a secure technology which enables two or more parties to communicate in a secure manner on the Internet. To assure security, it operates on HTTP. It functions in the Presentation layer. The SSL/TLS protocol runs on Port 443 and it is applied to the web server in the form of an SSL/TLS certificate.
HTTPS stands for Hypertext Transfer Protocol Secure. It is a combination of HTTP and SSL, which utilizes encryption to build a more secure browsing experience. The functioning of HTTPS involves the four upper layers of the OSI model – the transportation layer, session layer, presentation layer, and application layer.
When it comes to security, SSL is more secure than HTTPS.