What is Quantum electrodynamics (QED)?

Quantum electrodynamics (QED) is like a super-smart game that helps us understand how light and matter interact, just like when you play catch with your friend, but with tiny particles and invisible forces.

Imagine you're playing catch, but instead of a ball, you're throwing photons, the tiny, invisible packets of light. And instead of your friend, you're throwing them at electrons, the tiny building blocks inside atoms. QED is like the rulebook that tells us exactly how these photons and electrons interact.

In this game, when a photon hits an electron, it can make the electron move, kind of like getting bumped by a friend in the middle of a game. Sometimes, the electron can even send out its own photon, like passing the ball back to you. These exchanges happen all the time, and QED helps us predict exactly what will happen next, whether the electron will zoom off or stay put.

QED is the science that lets us see how these tiny players in the world of atoms act when they're playing catch with light.