What's the Difference between Silicone and Silicon?

Both materials are widely used, both contain silicon, and they are almost spelled the same, but there are significant differences between the two.

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What's the difference between silica, silicone, and silicon? - Quora

What's the difference between silica, silicone, and silicon? - Quora

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Difference between Silicon, Silica & Silicone

Shin-Etsu Silicone : What is silicone? : What is silicone made of?