>>13460610radio waves are just a range a light wavelengths/frequencies.
"What is light?" is a complex question that took a lot of time and effort to figure out. Often times in physics, there are layers to the answer. On explanation isnt enough, so you go further down to a more correct one. You can go into QM for the most exact answer, but most answers can be explained through the classical approach. The classical approach isn't wrong, per se, but rather it is simply not a fuller picture. Denying it would be like simply saying newton's laws are false, when that really isn't the case, even though it's incomplete.
In the classical view, light is an oscillating (oscillating -> wave) electric field and magnetic field that are perpendicular to each other (an EM wave). The electric field is much stronger, and usually the focus when teaching bout like - just know that the magnetic field is perpendicular.
>>13460760 kinda explains how to create EM waves (by accelerating charges).
Electric fields apply force on charged particles. In a vacuum (or normal air which is close enough), there are no charged particles, so an EM wave just moves at the speed of light, and has a wavelength/frequency related to it's energy level. But things get interesting when the vacuum light runs into a medium that isn't a vacuum/air.
When light crosses a boundary of a new medium, some of it reflects and some of it goes through (sometimes all or none too). The part that reflects simply bounces off like a billiard ball.
For the light that goes through, whether it be glass, water, or a brick wall, the medium is made up of charged particles. Charges create their own electric field, which means that an EM wave will interact with the field created by the medium when the wave/light runs into it. The resulting wave moves slower than the speed of light, c. Conductors are different from insulators as their electrons are free to move around the conductor freely (as opposed to being held down by an atom).
