The primary purpose of quantum key distribution (QKD) is to enable secure communication by utilizing quantum mechanics principles. QKD facilitates the generation and sharing of encryption keys between parties with a guarantee of security; if a third party attempts to intercept the key, the presence of interference can be detected. This technology aims to fortify data protection against potential breaches, offering a significant advancement over classical cryptography methods. Due to its security assurances, QKD is becoming increasingly important in safeguarding sensitive information.