3G - Third Generation. A general term that refers to wireless air interface technologies offering increased capacity and capabilities delivered over the original 1G and 2G digital wireless networks. 3G network standards describe minimum peak speeds of at least 200kbits/s, but many of the implementations of 3G air interfaces are much faster than that (in the low 10-20Mbits/s).
4G - Fourth Generation. A general term that refers to wireless air interface technologies offering increased capacity and capabilities delivered above the 3G digital wireless networks. 4G network standards describe peak speeds of 100Mbits/s for high mobility communications (such as moving cars) or 1Gbits/s for stationary users.
5G - the fifth generation technology standard for broadband cellular networks, which cellular phone companies began deploying worldwide in 2019. Low-band 5G uses a similar frequency range to 4G cellphones, 600-850 MHz, giving download speeds a little higher than 4G: 30-250 megabits per second (Mbit/s). Mid-band 5G uses microwaves of 2.5-3.7 GHz, allowing speeds of 100-900 Mbit/s, with each cell tower providing service up to several miles in radius.High-band 5G uses frequencies of 25–39 GHz, near the bottom of the millimeter wave band, although higher frequencies may be used in the future.
802.11 - IEEE 802.11 is a set of standards for implementing wireless local area network (WLAN) device communication in the 2.4, 3.6, ad 5 GHz frequency bands. The 802.11 family consists of a series of over-the-air modulation techniques that use the same basic protocol. The protocols a, b, g, n, etc. are often simply generalized an 802.11xx indicating multiple compatibility. Wireless access using the 802.11 protocol is commonly called “Wi-Fi” by consumers and consumer products. (Also see Wi-Fi)