End-to-end encryption is the process of applying a lock key or secure messages only to the communicating users. In another factor, it prevents eavesdroppers from being able to access your conversation.
This type of encryption works like a mailbox, anyone who has the public key can easily open the mailbox and put something inside but only the private key can access and open the mailbox.
E2EE is very important in so many ways. It keeps your data safe from hackers and also keeps your it private.