You know aluminum? It’s a great metal, but to make it last longer and look better, there’s a trick called anodizing. Basically, you dunk aluminum parts into an acid bath and run electricity through it. This makes a thin, tough layer form on the surface — kind of like a shield.
This layer does a few cool things: it stops the metal from getting rusty or worn out, makes the surface harder, and even lets it soak up colors if you want it to look nice. Plus, paint or glue sticks better afterward.
That’s why you’ll find anodized aluminum all over the place — in airplanes, buildings, gadgets, cars — wherever people want something that’s both strong and good-looking.