Build client web apps with C#


Blazor lets you build interactive web UIs using C# instead of JavaScript. Blazor apps are composed of reusable web UI components implemented using C#, HTML, and CSS. Both client and server code is written in C#, allowing you to share code and libraries.
Blazor is a feature of ASP.NET, the popular web development framework that extends the .NET developer platform with tools and libraries for building web apps.
Run on WebAssembly or the server
Blazor can run your client-side C# code directly in the browser, using Web Assembly. Because it's real .NET running on WebAssembly, you can re-use code and libraries from server-side parts of your application.

Alternatively, Blazor can run your client logic on the server. Client UI events are sent back to the server using SignalR - a real-time messaging framework. Once execution completes, the required UI changes are sent to the client and merged into the DOM.
Built on open web standards
Blazor uses open web standards without plugins or code transpilation. Blazor works in all modern web browsers, including mobile browsers.
(What is Transpilation ?)  Transpilation is the process of converting code written in one programming language to another. Transpilation to JavaScript is a common approach to enable languages to run in the browser, but often provides limited functionality.

Code running in the browser executes in the same security sandbox as JavaScript frameworks. Blazor code executing on the server has the flexibility to do anything you would normally do on the server, such as connecting directly to a database.
Share code and libraries 

Blazor apps can use existing .NET libraries, thanks to .NET Standard—a formal specification of .NET APIs that are common across all .NET implementations.
.NET Standard allows the same code and libraries to be used on the server, in the browser, or anywhere you write .NET code.

JavaScript interop


Your C# code can easily call JavaScript APIs and libraries. You can continue to use the large ecosystem of JavaScript libraries that exist for client side UI while writing your logic in C#.
When using server-side code execution, Blazor takes care of seamlessly executing any JavaScript code on the client.

Free tools for every operating system 


Visual Studio and Visual Studio Code provide a great Blazor development experience on Windows, Linux, and macOS. 

If you prefer to use a different editor, there are .NET command line tools that allow you to work with the editor of your choice. 

Summary 


 Find more information on what new features available in Blazor  Asp.Net Core features with Blazor

Downloads available at https://aka.ms/blazor-ebook