Connecting to two different wireless networks on different bands using the same network device on Linux

Nowadays, our wireless network adapters are able to connect to both 5GHz and 2.4GHz wireless networks. I also noticed that in some operating systems and devices, it is possible to connect to two different networks at the same time using the same adapter, as long as each of these networks use a different frequency You will notice this capability most often with: Devices such as Android, Windows, etc. connecting to a WiFi network and opening a hotspot at the same time. An Android or Windows device connecting to a wireless display (which utilizes WiFi Direct) and also staying connected to WiFi (I

Question by 9a3eedi on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.