ARRA (American Recovery and Reinvestment Act): Also known as the "stimulus package of 2009," which includes HITECH.

CA (Certificate Authority): A Certificate Authority issues digital certificates to organizations in order to ensure digital security on the Internet or other networks. Not all Certificate Authorities verify the validity and legality of organizations before issuing certificates like DigiCert does.

CMS (Centers for Medicaid and Medicare Services): This group is a federal service organization that works to improve the health workforce, inform consumers, build collaborations, and make the healthcare system affordable while maintaining high value.

Direct Address: It looks like an email and includes a health endpoint name (the location of a specific Direct user) and a health domain name (the location of a specific Direct HISP).

DirectTrust: A non-profit alliance of healthcare industry participants formed to create a national Security and Trust Framework to better implement the Direct initiative.

Direct Project- A federal initiative, spearheaded by the HHS and ONC, designed to facilitate the fast and secure transfer of health information.

DirectTrust- A non-profit alliance of health care industry participants formed to create a national Security and Trust Framework to better implement the Direct initiative.

DNS (Domain Name System): A system that assigns names to resources that connect to the Internet or networks. It facilitates rapid message transfer.

DURSA (Data Use and Reciprocal Support Agreement): An agreement all organizations and agencies must enter into if they want to be involved in electronic health information exchange. These groups must abide by the standards set forth by the ONC.

EHR (Electronic Health Record): A record of an individual or population which can include health information such as medical history, allergies, age, weight, billing address, etc.

FBCA (Federal Bridge Certification Authority): The authority that sets the national standards for digital certificate transfer.

HCO (Health Care Organization): An organization authorized by law to provide medical care and other health services for specific populations or coordinating bodies.

HHS (Health and Human Services): The Department of Health and Human Services is the federal agency in charge of protecting and providing for the health of Americans.

HISP (Health Information Service Provider): A for-profit corporation responsible for digitally delivering health information.

HITECH (Health Information Technology for Economic and Clinical Health Act): A federal law that incentivizes medical providers to implement Health Information Technology.

ISSO (Information Systems Security Officer): This individual ensures adequate protection of the Direct Cert Portal’s cryptographic keys. He or she also tracks and records who has access to the keys for their organization. Each HISP has at least one ISSO who ensures certificates are kept secure.

MU (Meaningful Use): A program that encourages and incentivizes organizations to implement certified electronic health record technology. The goal of compliance is to improve clinical outcomes and general population health, increase transparency, and enable more robust research data. Objectives evolve in three stages: Stage 1 from 2011 to 2012, Stage 2 in 2014, and Stage 3 in 2016.

ONC (Office of National Coordinator for Health Information Technology): ): The main federal agency within the Department of Health and Human Services that promotes health information technology across the U.S.

Representative: Within the Direct Cert Portal, the representative can prove ownership of the organization and authorize HISPs to get certificates in the organization's name.