What is Phantom Power?  
https://www.sonicmix.com/what-is-phantom-power/

What is Phantom Power? In simplest terms, phantom power is a method of powering a microphone through the same cable that is sending audio from the microphone. This means only one cable is used to connect, power, and send audio from a microphone. In some cases microphones can be powered in other ways, like with batteries. Most modern microphones used...
by sonicmix