what is 3g

3G is an acronym for 3rd Generation English, refers to third generation mobile communication technologies. Relative first-generation analog mobile phone system (1G) and second-generation GSM, TDMA digital mobile phone (2G), third-generation mobile phone generally, refers to wireless communications and multimedia communications, such as the Internet combined with the next-generation mobile communication systems.
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It can handle images, music, video streaming and other forms of media, including web browsing, conference calls, e-commerce and other information services. In order to provide such services, the wireless network must be able to support different data transmission speed, that is to say in the indoor, outdoor and vehicular environments, respectively, be able to support at least 2Mbps (megabits / second), 384kbps (kilobytes / each second) and 144kbps transmission speed.
http://blogs.grab.com/msary50/727356