Quantum key distribution (QKD) enhances communication security by using the principles of quantum mechanics to create secure cryptographic keys. Unlike classical key distribution methods, QKD allows the communication of keys in a way that detects any eavesdropping attempts. When an unauthorized party tries to intercept the quantum data, it alters the quantum states, alerting the communicating parties to potential security breaches. This ensures that only legitimate users can share encrypted information securely, establishing a fundamentally more secure method for providing communication confidentiality.