Dual-band Wi-Fi, as opposed to single-band Wi-Fi, is a feature on routers that enables them to emit wireless signals on two separate frequency bands. While a single-band router would only emit frequency from a 2.5GHz band, a dual-band router uses both 2.4GHz and 5GHz bands. This additional frequency band helps increase speeds and improve connectivity by distributing traffic that is normally funneled through just one frequency band.