End-to-end encryption (E2EE) is a method of data protection where information is encrypted on the sender's device and remains encrypted while in transit until it is decrypted on the recipient's device. This ensures that only the sender and the intended recipient can access the data, preventing any third parties, including service providers or hackers, from intercepting or tampering with the information. E2EE is widely used to enhance security and privacy in communication and data transfer, ensuring that sensitive information remains confidential and protected throughout the entire transmission process.