Hypertext Transfer Protocol
HTTPS is used by default by most web browsers (even if not requested by the user), assuming the web server supports it. If browsing to a website, and the web browser shows it starting with http: without an s before the colon (or an unlocked icon is seen), then that website is not secure, then passwords or other data sent to them can be stolen. HTTPS encrypts all the information that is sent and received. This can stop malicious users such as hackers from stealing the information. HTTPS uses port 443 for communication instead of port 80.