ELI5: How does a compass work?

Imagine the Earth is like a giant magnet. It has a magnetic field all around it, kind of like an invisible force field.

A compass is a simple tool that helps us find North. It has a little needle inside that's also a tiny magnet. This needle is specially made to spin freely.

Here's how it works:

• The Earth's magnetic field pulls on the needle inside the compass.
• One end of the needle is called the north-seeking pole, and it's attracted to the Earth's magnetic north pole.
• Because the needle can spin, it turns until the north-seeking pole lines up with the Earth's magnetic field.
• That's why the needle always points towards North (or very close to it).

So, a compass works because the Earth is a giant magnet, and the compass needle is a smaller magnet that's free to spin and align itself with the Earth's magnetic field, showing us which way is North. It's all about magnetism!