This document provides an introduction to HTTPS (Hypertext Transfer Protocol Secure), which combines the HTTP protocol with SSL/TLS encryption to create a secure channel over an insecure network. It discusses why HTTPS is needed to securely transmit confidential data like credit card numbers over the internet, compared to the insecure HTTP protocol. The document also compares HTTP and HTTPS, explaining that HTTPS should be used when transmitting sensitive information that requires encryption, such as passwords or financial details.