ELI5: Explain Like I'm 5

Electromagnetic electron wave

Imagine you're in a pool (not too deep, just a few feet deep) and you're holding onto a noodle. You start wiggling the noodle back and forth and you see waves moving through the water. This is kind of like what happens with an electromagnetic wave.

Instead of water, though, we're talking about something called an "electric field" and a "magnetic field". These are invisible forces that can push and pull things (kind of like how you can push and pull the noodle in the water).

When you have an electric field that changes (like the noodle wiggling in the water), it creates a magnetic field that also changes. And when that magnetic field changes, it creates an electric field that changes again. This creates a sort of chain reaction of changing fields that keeps going and going.

That chain reaction of changing fields is what makes up an electromagnetic wave! And just like the waves in the water, these waves can travel through things. In the case of electromagnetic waves, they can travel through things like air or even empty space.

When an electromagnetic wave travels through space, it's made up of tiny things called electrons (which are too small for us to see). These electrons get pushed and pulled by the changing electric and magnetic fields, which makes the wave keep moving forward.

This might all sound kind of confusing, but the important thing to remember is that an electromagnetic wave is like a chain reaction of invisible forces that can push and pull electrons, and that allows it to travel through space.
Related topics others have asked about: