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You've learned that a React component is a small, reusable chunk of code that is responsible for one job, which often involves rendering HTML.

Here's another fact about components: every component must come from a component class.

A component class is like a factory that creates components. If you have a component class, then you can use that class to produce as many components as you want.

To make a component class, you use one of the methods in the React library: React.createClass.

Look at the code in app.js. A lot it is still unfamiliar, but you can understand more than you could before!

On line 4, you know that React.createClass's job is to create a component class, which is like a factory for building React components. You also know that React.createClass is one of the methods on the object returned by require('react'), on line 1.

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