"5G is the fifth generation of cellular technology, and is the successor to 4G/LTE.
5G takes advantage of many chunks of spectrum ranging from long-range UHF frequencies up through short-range extremely high millimeter-wave frequencies (mmW)
When broadcast over long-range frequencies, 5G may only have a modest speed improvement over 4G/LTE. In core urban and suburban areas that are frequently overloaded the extra capacity that 5G brings to cellular allows for dramatic overall improvements.
NOTE: 5G cellular and 5Ghz Wi-Fi are entirely different things."