What is the relationship between the electric and magnetic fields of an electromagnetic wave?

Electromagnetic waves, such as radio waves, are composed of both an electric field and a magnetic field. As the wave travels through space, these two fields continuously generate each other and oscillate together. Crucially, these fields are always oriented perpendicular (at 90 degrees or "right angles") to one another. They also travel at the exact same speed—the speed of light—meaning distractors suggesting they travel at different speeds or in parallel are incorrect.