Reduction vs Oxidation: What's the difference

What is the difference between reduction and oxidation? Especially when talking about ions and molecules involved in cellular respiration and photosynthesis.

Reduction is Gain, Oxidation is lose. (OIL RIG), there is a gain and lose of electrons

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part of it if molecule
LEO says GER
Losing electrons oxidizes
gaining electron reduction

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OILRIG. Oxidation is losing electrons and reduction is gaining. This can be flip-flopped a lot of times in biology if dealing with H+ ions instead of electrons.

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