FPV is First Person View, in the drone world it’s simple. There is a camera on the drone connected to a video transmitter thats sends anolog video signal to a receiver. Receiver can be either a screen that you will look at like a TV or FPV goggles that you would wear on your head either box goggle or 2 screens inside one for each eye. People use whatever works for them and there is not really a better option. In the end it’s all what works best for you.
Here is an example of a FPV feed: