802.11ac, also known as Gigabit Wi-Fi, is a specification in the IEEE 802.11 family applicable to WLANs (wireless local area networks). 802.11ac represents an extension or update of the legacy 802.11a standard. 802.11ac sits between 802.11n and 802.11ax on the standards timeline and operates strictly in the 5 GHz spectrum. More @Wikipedia
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