ASP.NET Core Blazor

Blazor is a framework for building interactive client-side web UI with .NET:

Create rich interactive UIs using C# instead of JavaScript. Share server-side and client-side app logic written in .NET. Render the UI as HTML and CSS for wide browser support, including mobile browsers. Integrate with modern hosting platforms, such as Docker. Build hybrid desktop and mobile apps with .NET and Blazor.

Using .NET for client-side web development offers the following advantages:

Write code in C# instead of JavaScript. Leverage the existing .NET ecosystem of .NET libraries. Share app logic across server and client. Benefit from .NET's performance, reliability, and security. Stay productive on Windows, Linux, or macOS with a development environment, such as Visual Studio or Visual Studio Code. Build on a common set of languages, frameworks, and tools that are stable, feature-rich, and easy to use.

Components

Blazor apps are based on components. A component in Blazor is an element of UI, such as a page, dialog, or data entry form. Components are .NET C# classes built into .NET assemblies that: Define flexible UI rendering logic. Handle user events. Can be nested and reused. Can be shared and distributed as Razor class libraries or NuGet packages. The component class is usually written in the form of a Razor markup page with a .razor file extension. Components in Blazor are formally referred to as Razor components, informally as Blazor components. Razor is a syntax for combining HTML markup with C# code designed for developer productivity. Razor allows you to switch between HTML markup and C# in the same file with IntelliSense programming support in Visual Studio.

All source of information collected from learn Microsoft page.