What's the Difference Between Baking Soda and Baking Powder?

They have almost the same name and look identical, so what exactly is the difference between baking soda and baking powder?

Baking Soda vs. Baking Powder: What's the Difference?

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Baking Powder vs Baking Soda - What's the Difference?

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Periodic Graphics: Baking soda versus baking powder

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Baking Soda vs Baking Powder

What's the difference between baking powder, baking soda and bicarbonate of soda?

Baking Soda vs Baking Powder - What's the Difference?

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Baking powder vs. baking soda: How they're different, which to use when and more - The Washington Post

How to Substitute Baking Powder and Baking Soda