HTTPS vs. HTTP
HTTPS stands for Hypertext Transfer Protocol Secure.
The problem with the regular HTTP protocol is that the information that flows from server to browser is not encrypted, which means it can be easily stolen.
HTTPS protocols remedy this by using an SSL (secure sockets layer) certificate, which helps create a secure encrypted connection between the server and the browser, thereby protecting potentially sensitive information from being stolen as it is transferred between the server and the browser. For that reason, the vast majority of sites now use HTTPS.