Here's a breakdown:

* Oxidation is a chemical process where a molecule loses electrons. This can happen in a few ways, but the two most common are:

* Gaining oxygen atoms: Oxygen is very electronegative, meaning it attracts electrons strongly. When a molecule gains oxygen, the oxygen pulls electrons away from the molecule, causing it to become oxidized.

* Losing hydrogen atoms: Hydrogen, on the other hand, is not very electronegative. When a molecule loses hydrogen, it's effectively losing electrons, and therefore becoming oxidized.

Important Note: Oxidation and reduction always happen together. If one molecule is oxidized (loses electrons), another molecule must be reduced (gains electrons). This is called a redox reaction.

Let me know if you'd like more details on redox reactions!