End-to-end encryption is a method of securing data so that only the sender and the intended recipient can read it. In this system, messages are encrypted on the sender's device and can only be decrypted by the recipient's device. This means that even if the data is intercepted during transmission, it remains unreadable to anyone else, including service providers. This technology is commonly used in messaging apps like WhatsApp and Signal, ensuring that private conversations stay confidential. By using strong encryption algorithms, end-to-end encryption protects sensitive information from unauthorized access, enhancing user privacy and security in digital communications.