4G (or 4-G) is short for fourth-generation. The WWRF (Wireless World Research Forum) defines 4G as a network that operates on Internet technology, combines it with other applications and technologies such as Wi-Fi and WiMAX, and runs at speeds ranging from 100 Mbps (in cell-phone networks) to 1 Gbits (in local Wi-Fi networks).
4G is not just one defined technology or standard, but rather a collection of technologies and protocols to enable the highest throughput, lowest cost wireless network possible. The official designation from the IEEE for 4G is Beyond 3G.
Link : Wikipidia
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