End-to-end encryption (E2EE) is a security method that ensures only the communicating users can read the messages they send to each other. The data is encrypted on the sender’s device and only decrypted on the recipient’s device, making it inaccessible to intermediaries like service providers, hackers, or government agencies. This technique is widely used in messaging apps, email services, and file storage to protect sensitive information from unauthorized access. Even if the data is intercepted during transmission, it remains unreadable without the unique decryption keys held only by the communicating parties.