Instant messaging refers to what? How to use it? Charges do not?

Users questions:
Experts answer: IM (Instantmessaging, referred to as IM), refer to online real-time communication tools, also known as the online chat tool. Real-time information as early as in 1996 became popular, when the most famous instant messaging tool for ICQ. ICQ Originally developed by three Israelis in 1998, acquired by AOL, is still the most popular instant messaging tool, the end of 2003, the global ICQ users more than 1.5 billion, of which more than 60% in the U.S. outside the countries in the world. Instant messaging applications are for individuals And the different types of enterprise applications, currently dominated by the individual applications, and mostly free services. The commonly used instant messaging tools abroad ICQ, Yahoo Messenger (Yahoo! Messenger), MSN Messenger (MSNMessenger), AOL Instant Messenger (AIM), as well as national web site provides tools such as instant messaging chat Teng Xun's QQ, Sina UC and so on. In addition, a site within the online real-time communication between users is also a real-time information on a specific application form.
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