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+# ASP.NET Core MVC / Razor Pages UI
+
+## Introduction
+
+ABP Framework provides a convenient and comfortable way of creating web applications using the ASP.NET Core MVC / Razor Pages as the User Interface framework.
+
+ABP doesn't offer a new/custom way of UI development. You can continue to use your current skills to create the UI. However, it offers a lot of features to make your development easier and have a more maintainable code base.
+
+### MVC vs Razor Pages
+
+ASP.NET Core provides two models for UI development:
+
+* **[MVC (Model-View-Controller)](https://docs.microsoft.com/en-us/aspnet/core/mvc/)** is the classic way that exists from the version 1.0. This model can be used to create UI pages/components and HTTP APIs.
+* **[Razor Pages](https://docs.microsoft.com/en-us/aspnet/core/razor-pages/)** was introduced with the ASP.NET Core 2.0 as a new way to create web pages.
+
+**ABP Framework supports both** of the MVC and the Razor Pages models. However, it is suggested to create the **UI pages with Razor Pages** approach and use the **MVC model to build HTTP APIs**. So, all the pre-build modules, samples and the documentation is based on the Razor Pages for the UI development, while you can always apply the MVC pattern to create your own pages.
+
+### Modularity
+
+[Modularity](../../Module-Development-Basics.md) is one of the key goals of the ABP Framework. It is not different for the UI; It is possible to develop modular applications and reusable application modules with isolated and reusable UI pages and components.
+
+The [application startup template](../../Startup-Templates/Application.md) comes with some application modules pre-installed. These modules have their own UI pages embedded into their own NuGet packages. You don't see their code in your solution, but they work as expected on runtime.
+
+## Theme System
+
+ABP Framework provides a complete [Theming](Theming.md) system with the following goals:
+
+* Reusable [application modules](../../Modules/Index.md) are developed **theme-independent**, so they can work with any UI theme.
+* UI theme is **decided by the final application**.
+* The theme is distributed via NuGet/NPM packages, so it is **easily upgradable**.
+* The final application can **customize** the selected theme.
+
+### Current Themes
+
+Currently, two themes are **officially provided**:
+
+* The [Basic Theme](Basic-Theme.md) is the minimalist theme with the plain Bootstrap style. It is **open source and free**.
+* The [Lepton Theme](https://commercial.abp.io/themes) is a **commercial** theme developed by the core ABP team and is a part of the [ABP Commercial](https://commercial.abp.io/) license.
+
+There are also some community-driven themes for the ABP Framework (you can search on the web).
+
+### Base Libraries
+
+There are a set of standard JavaScript/CSS libraries that comes pre-installed and supported by all the themes:
+
+- [Twitter Bootstrap](https://getbootstrap.com/) as the fundamental HTML/CSS framework.
+- [JQuery](https://jquery.com/) for DOM manipulation.
+- [DataTables.Net](https://datatables.net/) for data grids.
+- [JQuery Validation](https://jqueryvalidation.org/) for client side & [unobtrusive](https://github.com/aspnet/jquery-validation-unobtrusive) validation
+- [FontAwesome](https://fontawesome.com/) as the fundamental CSS font library.
+- [SweetAlert](https://sweetalert.js.org/) to show fancy alert message and confirmation dialogs.
+- [Toastr](https://github.com/CodeSeven/toastr) to show toast notifications.
+- [Lodesh](https://lodash.com/) as a utility library.
+- [Luxon](https://moment.github.io/luxon/) for date/time operations.
+- [JQuery Form](https://github.com/jquery-form/form) for AJAX forms.
+- [bootstrap-datepicker](https://github.com/uxsolutions/bootstrap-datepicker) to show date pickers.
+- [Select2](https://select2.org/) for better select/combo boxes.
+- [Timeago](http://timeago.yarp.com/) to show automatically updating fuzzy timestamps.
+- [malihu-custom-scrollbar-plugin](https://github.com/malihu/malihu-custom-scrollbar-plugin) for custom scrollbars.
+
+You can use these libraries directly in your applications, without needing to manually import your page.
+
+### Layouts
+
+The themes provide the standard layouts. So, you have responsive layouts with the standard features already implemented. The screenshot below has taken from the Application Layout of the [Basic Theme](Basic-Theme.md):
+
+![basic-theme-application-layout](../../images/basic-theme-application-layout.png)
+
+See the [Theming](Theming.md) document for more layout options and other details.
+
+## Features
+
+TODO
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diff --git a/docs/en/UI/AspNetCore/Toolbars.md b/docs/en/UI/AspNetCore/Toolbars.md
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-# Toolbars
+# ASP.NET Core MVC / Razor Pages UI: Toolbars
 
 The Toolbar system is used to define **toolbars** on the user interface. Modules (or your application) can add **items** to a toolbar, then the [theme](Theming.md) renders the toolbar on the **layout**.