Here's why:
* Electromagnetism is a fundamental force: It governs the interactions between electrically charged particles.
* Force carriers: In quantum field theory, forces are mediated by exchange particles.
* Photons as mediators: Photons are massless, chargeless particles that travel at the speed of light. They are responsible for carrying the electromagnetic force between charged particles.
Here's a simple analogy: Imagine two people throwing a ball back and forth. The ball represents the photon, and the people represent the charged particles. The act of throwing and catching the ball is analogous to the exchange of a photon, which results in the electromagnetic force between the charged particles.
