Razor Pages, introduced in ASP.NET Core 2.0, have become the default coding method in ASP.NET Core. They simplify organizing code by keeping implementation logic and view models close to the view code. Razor Pages can handle complex scenarios similar to MVC, including routing, models, and actions. They consist of a UI and a page model, which combines models and controller actions. A demo shows the structure of Razor Pages, highlighting the index page and its components. Handlers, similar to controller actions, are used for GET and POST requests, with naming conventions like 'onGet' and 'onPost'.

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