* Instant Messaging is a form of electronic communication which involves immediate correspondence between two or more users who are all online simultaneously. [1] [2]
* Electronic communication allowing for instant correspondence between two or more users who are online at the same time. [3]

[1] Merrill Corporation, Electronic Discovery Glossary.
[2] Kroll Ontrack, Glossary of Terms, http://www.krollontrack.com/glossaryterms
[3] Vinson & Elkins LLP Practice Support, EDD Glossary.

Attributions
- EDRM (http://edrm.net)