Technically 4G refers to the fourth-generation of cellular wireless standards. It is a successor to 3G and 2Gstandards with the aim to provide broadband Internet access to mobile (as well as desktop) users.
Generally referred to as the fourth-generation mobile phone system, 4G technologies enable IP-based voice, data and streaming multimedia at higher speeds.
LTE stands for Long Term Evolution, which is the project name of a high
performance airinterface for cellular mobile communication systems. It
is the last step toward the 4G technologies designed to increase the capacity and speed of mobile telephone networks.