Protocols other than http and HTML?

To clarify, HTML is not actually a protocol in the sense that you're thinking; it's a language. Languages are of course protocols in themselves, but not in the commonly used sense in the IT field, which presumably is the nature of your question.

Some protocols commonly used in the IT field are:

  • HTTP (Hyper Text Transfer Protocol)
  • FTP (File Transfer Protocol)
  • SFTP (Secure File Transfer Protocol)
  • POP3 (Post Office Protocol 3)
  • SMTP (Simple Mail Transfer Protocol)
  • IMAP (Internet Message Access Protocol)
  • SSH (Secure Shell)
  • NNTP (Network News Transfer Protocol)

This is of course only a small sample.

HTML is not a protocol. It is a mark up language.

Apart from http we have ftp, sftp, udp etc.