In a healthcare system, secure messaging system refers to the chat features that are built with strict adherence to industry-grade compliances like HIPAA, OWASP, and GDPR. Also, it ensures that every Patient's Health Information (PHI) is end-to-end encrypted.  Which means, every message is ciphered at the sender’s end and decrypted only at the recipient’s end. This way, no third-party can access the messages, which essentially contains the healthcare information.