HTML
Hypertext Markup Language. HTML is a set of symbols and instructions used to mark up a file so that a Web browser knows how to display the file’s information; HTML describes the appearance of information for Web browsers.
HTTP
Hypertext Transfer Protocol. HTTP is a set of rules for transferring information over the World Wide Web.
HTTPS
Hypertext Transfer Protocol Secure. An extension of HTTP that is used for secure communication over a computer network and the World Wide Web.