4G - fourth generation of mobile communications that uses broad band data transfer (high speed). By the fourth generation usually referred promising technology to transfer data at a rate exceeding 100 Mbit/s mobile and 1 Gbit/s - fixed subscribers.
Technology Mobile WiMAX Release 2 (also known as WirelessMAN-Advanced, or IEEE 802.16m) and LTE Advanced (LTE-A) was given the official designation of IMT-Advanced, which allowed them to qualify as genuine 4G network technologies, an alternative to leased lines and DSL.