What is Blazor?
As I indicated in the introduction, Blazor is an SPA framework used to build interactive web applications, just like other SPA frameworks such as Angular, React, and Vue.js. However, it has one important difference – we can use C# to build the application instead of JavaScript, which means we can run .NET in browsers. Blazor uses the .NET core runtime to execute the .NET code in the browser (for Blazor WebAssembly).
Running .NET in browsers is not a new idea. Microsoft has done it before with Silverlight. To run Silverlight applications, we had to install a plugin on the browser. Blazor, on the other hand, runs natively on the browser, thanks to WebAssembly technology, which is defined as the following on https://webassembly.org: