HTTPS Security and Spoofing – Who is that man in the middle?
HTTP stands for Hyper Text Transfer Protocol and is widely used on the Internet. In the early years of the Internet, it was acceptable for this protocol to request credentials, etc. because there was not much danger that people would sniff your data packets to steal your credentials for various websites. When people realized the danger, HTTPS (HTTP Secure) was invented, which encrypts the data exchange between you (the client) and the website with which you interact.
Read : Difference between HTTP and HTTPS.