About
The https scheme represents HTTP-over-TLS 1)
HTTP is a application protocol (OSI level 7) that is build on TCP as transport layer (OSI level 3)
HTTPS is essentially HTTP after the connection has been secured with TLS (ie SSL, ie TCP with SSL) (ie when the SSL handshake (negotiation) has succeed).
Chrome:
Management
Port
The port is 443.
Deploying
See How to enable SSL on a server (ie HTTPS on a web server) ?
Mandatory
To make https mandatory for a website, set the Strict Transport Security (HSTS) header