In health care, what is an API?

• A. A database schema for patient records.
• B. A physical device interface on hospital networks.
• C. A data encryption standard for cloud storage.
• D. An Application Programming Interface; enables software systems to communicate and exchange data.

Answer: (D)

An API is an Application Programming Interface, a defined set of rules that lets different software programs talk to each other and share data. In health care, APIs let systems such as electronic health records, lab information systems, and patient portals communicate, request data, or trigger actions without needing to know how each system is built. By exposing endpoints, agreeing on data formats (often using standards like HL7 FHIR), and handling authentication and permissions, APIs enable secure, interoperable data exchange between diverse applications.

The other descriptions miss what an API does: a database schema is about how data is stored, not how software interfaces communicate; a physical device interface refers to hardware connections; a data encryption standard focuses on protecting data rather than enabling software-to-software communication.