HTTPS stands for Hypertext Transfer Protocol (Secure). It is a very commonly used protocol for secure communication throughout the internet.
HTTPS provides website authentication, which essentially proves whether the website is what it says it is. This prevents what is known as “man-in-the-middle attacks,” where the attacker intercepts and sometimes alters communication data between 2 parties (in most cases, either the user and the website server or 2 users.)
In addition, it keeps the transferred data private and secure. This is achieved by encryption and minimal tracking.
If you are wondering whether a site is using HTTPS, look in the URL bar. Most major, commonly visited websites use HTTPS.