Let's Encrypt   

Request SSL certificates from letsencrypt.org



This module will show the locker in the web browser, indicating that the traffic between the server and the client is encrypted and secure.

This used to be very important when connecting to secure websites such as banks and similar "high secure websites". Since a few years ago these secure sites also include streetfood menues and other non-sensitive websites.

Basically every site there is, need SSL encryption and  the locker cymbol!