In this article, you could learn what are 2.4 GHz WiFi and 5 GHz WiFi and whats the difference between them.
Is my router 2.4g or 5g?Differences between 2.4GHz and 5GHz networks. – Noorio Innovations
What is the Difference Between 2.4GHz and 5GHz Wifi?
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2.4GHz vs. 5GHz WiFi: What's the difference and how to use it?