Hypertext transfer protocol secure (HTTPS) is the secure version of HTTP (Hyper Text Transfer Protocol), which is the primary protocol used to send data between a web browser and a website. HTTPS is encrypted in order to increase security of data transfer, and secures the communication between two systems e.g. the browser and the web server.This is particularly important when users transmit sensitive data e.g. financial transactions, bank details, user credentials and other private information.
Web browsers take HTTPS seriously - you can see if a webpage is secure by the padlock in the URL bar. Google Chrome and other browsers flag all non-HTTPS websites as 'not secure'. All websites, especially those that require login credentials, should use HTTPS.
HTTPS protects data from being read and modified by hackers during the transfer between browser and web server. As it is encrypted, hackers won't be able to use the messages even if they do manage to intercept the communication.