HTTP means Hyper Text Transfer Protocol
HTTPS means Hyper Text Transfer Protocol Secure
HTTP is a protocol which used to allow you to communicate with web sites.
HTTPS is a secure extension and information exchanged between you and a web site is encrypted and cannot be hijacked by someone who might want to electronically trap when you type a credit card number, a password, a social security number, or any other person information. There are two common types of encryption layers: Transport Layer Security (TLS) and Secure Sockets Layer (SSL), both of which encode the data records being exchanged.
Default port for HTTP is 80 for http and 443 for https. Except these point HTTPS follows the same HTTP protocols.