Okay, so we learn in basic physics that electric fields are created by charges and that magnetic fields are created by moving charges. After that, we learn that those two are just two faces of the same coin: the electromagnetic field. Also, we know that electromagnetic waves travel trough the electromagnetic field, and that those waves are just perturbations on this field. What I'm having trouble to understand is: does the EM field exists everywhere in the space? Even where there are no charges? So it's not possible to exist some region on space where there's no EM field?