Here's a breakdown:

* Electric Field: This field is responsible for the force experienced by charged particles. In an electromagnetic wave, the electric field oscillates perpendicular to the direction of wave propagation.

* Magnetic Field: This field surrounds moving charges and exerts a force on other moving charges. In an electromagnetic wave, the magnetic field also oscillates perpendicular to the direction of wave propagation.

Importantly, the electric and magnetic fields oscillate in phase, meaning they reach their maximum and minimum values at the same time. This synchronized oscillation is what creates the wave and allows it to propagate through space.

Think of it like this: Imagine a rope tied to a wall. If you shake the rope up and down, you create a wave that travels down the rope. In this analogy, the rope itself represents the electric field, and the shaking motion is the oscillation. The magnetic field would be a similar wave traveling alongside the rope, but perpendicular to its motion.

Key takeaway: The electric and magnetic fields are the fundamental components of electromagnetic waves, and their oscillations are what create the wave and allow it to travel.