Most definitions found in this glossary are adapted with permission from this text book:

Maheu, M., Whitten, P., & Allen, A. (2001). eHealth, Telehealth & Telemedicine: A Guide to Startup and Success. New York: Jossey-Bass.

Browse the glossary using this index

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Access control

The prevention of unauthorized access to information through the use of policies or software that determine who can have access to what data contained on a computer network (both within and outside the organization).
Entry link: Access control

American National Standards Institute (ANSI)

A private, nonprofit organization that administers and coordinates standardization in the U.S. private sector. ANSI seeks to enhance the competitiveness of U.S. businesses in the global market and promote the American way of life by organizing voluntary consensus standards, promoting U.S. business integrity, and facilitating conformity assessment systems.
Entry link: American National Standards Institute (ANSI)


Describing wave-shaped electrical signals that continuously change size and shape depending on the information being transmitted. Signal variations lead to differences in volume, voice, and pitch.
Entry link: Analog


Describing a communication system, such as e-mail, in which there is a lapse between the time a message is sent and the time it is received.
Entry link: Asynchronous

Asynchronous transfer mode (ATM)

A data transmission technology in which a start signal precedes each data packet, and one or more stop signals follow it. These individual packets of information are easily prioritized and routed, which enables the seamless integration of audio, video, and data. ATM also denotes the complete system of protocols and equipment associated with packet-based communication networks.
Entry link: Asynchronous transfer mode (ATM)


Two-way remote voice communication among multiple individuals.
Entry link: Audioconferencing

Audit trail

A comprehensive or selective method of monitoring every operation an individual performs on information.
Entry link: Audit trail


A method of verifying the identity of the individual sending or receiving information by use of passwords, biometrics, keys, digital or electronic signatures, and other automated identifiers.
Entry link: Authentication