With the advancement of technology many previously limited to computers are now available on tablets (iPad, Icona, Galaxy, etc.) and mobile phones. For example, many people utilize instant messaging (IM) instead of texting. There are several instant messaging free services. Below are the definitions according to Gartner.
Instant Messaging (IM): is a communications service in which short messages appear in pop-up screens as soon as they are received, thereby commanding the recipient’s immediate attention. Most IM services offer presence information that indicates if the user is online and available to send and receive messages. These services also provide “buddy lists” that are groups of people who have been selected by the user for frequent access, as well as group-based chat services. Enterprise IM provides real-time message passing within private and public networks.
AOL Instant Messenger (AIM): A free, public instant-message service and one of the earliest. A variety of free client software is available, supporting Windows and Macintosh PCs, Palm operating system (OS), Microsoft’s Pocket PC and Symbian handheld devices. See also instant messaging (IM).
Windows Live Messenger: An enterprise IM service operating via Microsoft Exchange servers but compatible with MSN IM.
Yahoo Messenger: Free public IM service.
All three services, AIM, WM, and Yahoo are available for free on your laptop and as apps for devices such as iPad, iTouch, iPhone, Blackberry, Droid, etc. The apps are free for tablets and phones, but you need internet service on your device to send messages.
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IT Glossary: http://www.gartner.com/technology/it-glossary/