Hello, everyone!
There are many different versions of Wi-Fi: 802.11a, 802.11b, 802.11g, 802.11n 802.11h, 802.11i, 802.11-2007, 802.11-2012, 802.11ac,802.11ad, 802.11af, 802.11-2016, 802.11ah, 802.11ai, 802.11aj, 802.11aq, 802.11ax 802.11ay.
Equipment frequently supports multiple versions of Wi-Fi. To communicate, devices must use a common Wi-Fi version. The versions differ between the radio wavebands they operate on, the radio bandwidth they occupy, the maximum data rates they can support and other details. In general, lower frequencies have better range but have less capacity. Some versions permit the use of multiple antennas, which permits greater speeds as well as reduced interference.
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