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1. What is the purpose of the `require()` function in Node.js?
2. What is the difference between a module and a package in Node.js?
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3. How do you create a custom module in Node.js?
4. What is the purpose of the `package.json` file in Node.js?
5. How do you install Node.js modules from the npm registry?
6. What is the difference between `npm install` and `npm link`?
7. How do you use the `fs` module to read a file in Node.js?
8. What is the purpose of the `async/await` syntax in Node.js?
9. What is the difference between `Promise.all()` and `Promise.race()`?
10. How do you handle errors in Node.js?