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Have you ever left your bike out in the garden and when you came back to it (after a long time of forgetting about it!) it is a bit rusty?
Rust can happen to anything made out of iron or steel, which are both metals.
Rust looks orange. It appears on the surface of the metal, and over time can spread and get deeper into the metal, eventually weakening the metal and sometimes even forming a hole.
Rusting occurs when the metal reacts with oxygen, in the presence of moisture.
The chemical name for rust is iron oxide. Oxide basically means that there is oxygen in it.
You can prevent your bike from rusting by keeping it dry, or protecting it with a layer of paint or oil to stop the oxygen getting to the surface.
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