What is 1G, 2G, 3G or 4G (1st, 2nd, 3rd, 4th generation)?

1G, 2G, 3G and 4G are the wireless communication standards. 1G is based on analog communications which offers 2.4 kbps. It was based on a technique known as FDMA ( Frequency division multiple access). 2G which is a digital communications standard and is based on GSM offers 64 kbps.it is based on the combination of TDMA ( Time division multiple access) and FDMA (Frequency division multiple access).CDMA ( Code division multiple access) also comes under 2G. 3G is based on the WCDMA concept and it offers increased data rates of 144 kbps - 2 mbps. 4G is based on LTE technology and it offers data rates of 100 mbps - 1 gbps. LTE-A and LTE pro are the enhancements to LTE technology.