Why is the app.module.ts file missing in the latest Angular project setup?

I am currently learning Angular as a complete beginner and following a tutorial from a book. In the tutorial, the app.module.ts file is introduced at the very beginning. However, I cannot find this file in my project after setting it up. I downloaded the latest version of Angular via npm. Why is the app.module.ts file missing from my project? Additionally, what is the purpose of the module file in Angular, and why is it important?

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