The 2.4 GHz wavelength offers superior range thanks to its ability to penetrate solid objects, such as walls and furniture, reasonably well. Higher frequency signals lose considerably more power when they encounter a solid obstacle, making them suitable primarily for short-distance applications.
The 5 GHz wavelength offers a much higher bandwidth (up to 1 Gbps), making it great for high-bandwidth applications like 4K video streaming.
While both wavelengths are susceptible to signal interference, 2.4 GHz wireless networks are affected by a whole range of radio frequency-emitting devices, including cordless phones, microwave ovens, wireless security cameras, gaming controllers, garage door openers, baby monitors, and others.
The good news is that most modern WiFi routers can broadcast simultaneously a 2.4 GHz and 5 GHz signal from the same unit, giving you the best of both worlds. Because dual-band routers make it possible to assign a single SSID to the two bands, users only see one network, and can connect to it with ease.