ASP.NET Blazor is a web framework developed by Microsoft that allows developers to build interactive web applications using C# and .NET instead of relying solely on JavaScript. Blazor enables the creation of client-side web applications using C# code that can run directly in the browser as well as server-side web applications that leverage the power of .NET on the server.

There are two main flavors of Blazor:

  1. Blazor WebAssembly: In this model, the C# code is compiled to WebAssembly, which is a binary instruction format that can be executed by modern web browsers. This allows you to build full-fledged web applications using C# and .NET that run in the browser without the need for JavaScript. Blazor WebAssembly applications can work offline and offer a rich user experience.
  2. Blazor Server: In this model, the application’s UI logic is executed on the server, and the UI updates are sent to the browser over a SignalR connection. This approach provides a familiar programming model for .NET developers and ensures that the UI logic is executed on the server, which can lead to improved performance and security.

Blazor offers a component-based architecture, where UI elements are encapsulated into reusable components that can be composed to build complex interfaces. These components can be created using C# and Razor syntax, a blend of HTML and C# code.

Blazor also integrates seamlessly with other ASP.NET technologies, allowing you to leverage existing skills and tools. It provides a unified development experience for both client-side and server-side applications, and developers can choose the approach that best fits their project requirements.

In summary, ASP.NET Blazor is a modern web framework that empowers developers to create interactive and dynamic web applications using C# and .NET, either by compiling C# to WebAssembly or by running C# on the server.