"E2E" signifies "end-to-end" in digital communication security, referring to the practice of encrypting data so that it is protected from the origin to the destination. This method ensures that only the intended recipient can access the content, preventing unauthorized interception during transmission. End-to-end encryption is particularly crucial for protecting sensitive communications, such as in messaging applications or financial transactions. By ensuring that data remains secure throughout its entire journey, E2E enhances user privacy and trust in digital services, making it a fundamental aspect of modern cybersecurity protocols.