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Wi-Fi frequency bands refer to specific ranges of the radio frequency spectrum that Wi-Fi networks use to transmit data between devices. The two most commonly used Wi-Fi frequency bands are the 2.4GHz and 5 GHz bands. The 2.4GHz band has been used for Wi-Fi for many years and offers good range and wall penetration but is susceptible to interference. The 5GHz band offers faster speeds and is less congested than the 2.4GHz band but has shorter range and poorer wall penetration.