Quantum Cryptography is a cryptographic technique that uses the principles of quantum mechanics to secure data transmission. It works by encoding information into individual particles of light or matter, called qubits, which are then sent through an encrypted channel. The data is then decrypted by the receiver using a special set of algorithms and keys. Quantum Cryptography is considered unbreakable, as it relies on the fundamental laws of quantum physics and the impossibility of accurately predicting the outcome of measurements.