Encryption: what it means
Encryption turns data into a form that can't be read without a key. With end-to-end encryption only the sender and the receiver can read a message, not even the service that carries it. The padlock (https) in your browser means your connection to the site is encrypted.
Useful pages
Related terms
Cybersecurity · VPN · Two-factor authentication (2FA)
This is general information, not legal advice. Check the exact rules with an official source.