HTTP (Hypertext Transfer Protocol)
HTTP is the protocol for WWW. 
Web pages and other resources to accessed using HTTP.

When a client enters http://www.kaputa.com address into a Web browser, DNS help resolve the Domain Name (FQDN) to an IP address. 
When the address is resolved, an HTTP get request is sent to the Web server. The Web server responds with an HTTP send response. HTTP uses TCP for communication between clients and servers. HTTP operates on port 80.

HTTPS (Hypertext Transfer Protocol Secure)
HTTPS provides additional security by using certificate-based authentication and encrypts all data packets echanged during a session.