What are "HTTP" and "HTTPS"?

What is HTTP?
HTTP stands for Hypertext Transfer Protocol. It is an application-level protocol for distributed, collaborative, hypermedia information systems. And its use for retrieving inter-linked resources led to the establishment of the World Wide Web.

What is HTTPS?
HTTPS stands for Hypertext Transfer Protocol Secure. HTTPS is a combination of the Hypertext Transfer Protocol and a network security protocol.

HTTPS has also been known as "Hypertext Transfer Protocol over Secure Socket Layer", but now HTTPS may be secured by the Transport Layer Security (TLS) instead of Secure Sockets Layer (SSL) protocol.

To invoke HTTPS, one replaces "http://" with "https://" in the URI, or Web address.

HTTPS connections are often used for payment transactions on the Web and for sensitive transactions in corporate information systems.

So, when you do payment transactions on the internet or you do any sensitive transactions in corporate information systems in the internet, please make sure the website URL start with "https://". And also read the URL one more time,
make sure you are in the right website.