# Creating and nesting components 

By [KAY](https://paragraph.com/@kay-4) · 2024-01-12

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React apps are made out of _components_. A component is a piece of the UI (user interface) that has its own logic and appearance. A component can be as small as a button, or as large as an entire page.

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*Originally published on [KAY](https://paragraph.com/@kay-4/creating-and-nesting-components)*