Wi-Fi 6 means 802.11ax technology - the new generation of Wi-Fi, present in many routers you can buy today Wi-Fi 5 means 802.11ac technology - effectively the previous generation Wi-Fi 4 means 802.11n technology - many people will have networking gear based on 802.11n, but it was replaced by 802.11ac in many new routers from 2013 on.
