FHIR, which stands for Fast Healthcare Interoperability Resources, is an open standard developed by HL7 to facilitate the exchange of healthcare information in a consistent, modular, and web-friendly format. It uses RESTful APIs and modern web standards to enable healthcare systems and apps to communicate. FHIR supports interoperability, enhances patient access to data, and is scalable and efficient for research, mobile health, and compliance. By enabling secure and flexible data sharing, FHIR is transforming how healthcare data is accessed, analyzed, and integrated across providers and patients.