Interoperability means different information systems (devices, applications, or others) can access and use data together in harmony. EHR interoperability is the ability of digital health record systems to interact seamlessly and securely while sharing information with other systems that are compatible to communicate in industry-standard formats. Interoperability can be achieved in an EHR system while abiding by the guidelines created by SDOs, such as:  Fast Healthcare Interoperability Resources (FHIR): Protocols for exchanging care data at the clinic and administrative levels. Health Level 7 (HL7): Standard controlling the exchange of data through the v2 messaging system. Health Relationship Trust (HEART): Profiles that allow patients to control access to their healthcare data.