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Encryption is the process of scrambling a message's contents so that only authorized individuals can access it. There are two main types: symmetric and asymmetric encryption. In symmetric encryption, Alice encrypts a sensitive document with a password and sends it to Bob, but he can't open it without the passphrase. The challenge arises in securely sharing this passphrase; sending it via email is risky as it could be intercepted. This scenario highlights the limitations of symmetric encryption and sets the stage for the development of asymmetric encryption, addressing the issue of key distribution more securely.