What is E2E Encryption?
E2E Encryption is an abbreviation for End to End Encryption.
Usually used when referring to messaging platforms like WhatsApp, Signal, and Messenger, it means that your messages are encrypted from your device to your recipient's device. WhatsApp / Signal / Facebook are unable to read the messages in transit.
For now, anyway. Lawmakers in the EU are attempting to force tech companies to include backdoors, allowing them to view all messages. Stay tuned.