this post was submitted on 18 Aug 2023
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The confusing alphabet soup of Wi-Fi versions got renamed. 802.11n became Wi-Fi 4, 802.11ac became Wi-Fi 5, and 802.11ax became Wi-Fi 6. Wi-Fi 7 is still in development so 6 is the best in-use version.
Never heard about Wi-Fi 4. Always 'n' letter was advertised.
Wi-Fi 5 kinda associated with 5 GHz bandwidth, but can be also used on the 2.4 GHz.
802.11a was 5GHz long before Wi-Fi 5 was a phrase, and "Wi-Fi 5" as a phrase does not imply any particular frequency.