Figure: The everywhere always electromagnetic field

General Caption: Note the old IN/IS dichotomy or the single meaning for the two locutions:

1. Electromagnetic radiation (EMR) is a traveling, self-propagating, transverse wave state IN the electromagnetic field which is everywhere always in all spacetime---as illustrated in the image/images. This what is one says when being very exact.

2. Electromagnetic radiation (EMR) IS a traveling, self-propagating electromagnetic field---where one means by electromagnetic field the particular electromagnetic-field STATE constituted by the particular set of traveling, self-propagating EMR waves that you are considering.

1. The first locution is exactly true, but the second is what people usually say---it just easier to say: i.e., electromagnetic radiation (EMR) is a traveling, self-propagating electromagnetic field.
2. The EMR is independent of source or sink.
3. To generalize, one almost always says electromagnetic field meaning a particular electromagnetic field state, mutatis mutandis, for electric field and magnetic field.

Illustrations of the electromagnetic field which is everywhere always.

1. Image 1 Caption: A diagram of an arrangement of electric charge (both positive charge (+) and negative charge (-)) in oddly shaped electrical conductors and the apparently dominant electrostatic field caused by the fixed-in-space ideal point charge (a with positive charge (+)).

   The electric field lines are a visualization tool that at every point align with the electrostatic field at that point: the arrows give the direction of the electrostatic field.

   At the macrosopic level, there is NO electromagnetic field inside the electrical conductors, but at the microscopic scale there is---it just is small scale and averages away at the macroscopic scale.

   Remember the electromagnetic field is everywhere always in all spacetime.