reactjs – How to achieve the same results when using outlet in react router with Next js app router?

It is much easier than you think!

Parallel Routes in Next.js refer to the ability to define multiple routes that match a given URL. These routes are processed in parallel, and multiple pages/components can be rendered for the same URL.
You can define it like this:

pages/[slug].js

You can use Parallel Routes for the structure of the application.

Intercepting Routes are more about the logic executed before rendering a page, often involving server-side operations or checks.