I posted in another thread a couple months back about light and what light waves are, but now I can't find it
I'm sure you have seen the demonstration of magnetic force lines. I take a magnet, and place it bellow a peice of paper. Then, I sprinkle some iron fillings on the piece of paper. What do I see? I see that the iron fillings all line up, and make lines connecting one pole of the magnet with the other pole.
These lines are called lines of force. They behave a little bit like pieces of string. If I take a piece of string and I wiggle one end, that wiggle will travel down the piece of string to the other end. Similarly, if I wiggle the magnet, the force lines will also wiggle.
Now, instead of a magnet, we will use an electron. The force lines (aka, the Field) will look different than the magnet. Instead of connecting two ends, the force lines radiate outward from the electron like a child might draw rays radiating from the sun. These lines indicate the direction and magnitude that another charged particle would feel due to the presence of the electron.
If I grab that electron and wiggle it, the wiggle will travel outward along the force lines. The wiggle of the force lines is light. I can do the same thing with any charged matter, as long as I wiggle it or cause it to move non-inertially. Light is caused by the acceleration of charges.