The terms 5G and 5 GHz Wi-Fi are used to describe a wireless connection, but they have nothing in common. Anyone who mentions the term "Wi-Fi 5G" really means Wi-Fi at 5 GHz, which is completely different from the 5G cellular standard.
5G is a new mobile phone standard
We will soon hear a lot more about 5G. It is a cellular standard, successor to 4G LTE and 3G. 5G means "fifth generation", as it is the fifth generation of this model.
5G is designed to be much faster and have a slower delay than 4G LTE. We will see the first 5G smartphones in 2019, but first we need to develop mobile networks that support 5G.
So 5G is a new standard, and it has nothing to do with Wi-Fi. 5G will be used for cellular connections, and future smartphones will support Wi-Fi 5G and 5 GHz. Today's smartphones support 4G LTE and Wi-Fi at 5 GHz.
5GHz is one of two frequencies for Wi-Fi
Wi-Fi has two frequency bands you can use: 2,4 GHz and 5 GHz. The frequency of 5 GHz is newer. It was used extensively with the 802.11n Wi-Fi standard, which was originally released by 2009, but we continue to find it in modern Wi-Fi networks such as 802.11ac and Wi-Fi 6.
Wi-Fi 5 GHz is great. It offers more channels that do not overlap, which makes congestion much less. It is excellent in places with a lot of congestion Wi-Fi, such as apartment buildings where each apartment has its own router. Wi-Fi at 5 GHz is also faster than Wi-Fi at 2,4 GHz.
But despite slower speeds and increased congestion, the Wi-Fi 2,4 GHz has its advantages. The frequency of 2,4 GHz covers an area greater than 5 GHz and is better because it passes through walls thanks to larger radio waves. 5 GHz radio waves offer a faster connection but can not overcome obstacles.