Encryption is one of the most important technologies used to protect health information in digital medical systems. It transforms data into an unreadable format that unauthorized individuals cannot understand without the appropriate decryption key. Hospitals use encryption to protect medical records stored in databases, secure information transmitted between medical devices and servers, and reduce the risk of patient data exposure if communications are intercepted or files are stolen. However, encryption alone is not sufficient to provide complete protection. It must be supported by secure key management, user access controls, and clear security policies. Integrating these measures helps strengthen the confidentiality of health information and protect patient privacy.