
Blazor WebAssembly is a free, open-source web framework from Microsoft that lets you build interactive web applications using C# and .NET instead of JavaScript. It runs entirely in the browser using WebAssembly — a binary instruction format that modern browsers execute at near-native speed.
When the user visits your app, the browser downloads the .NET runtime and your compiled app as WebAssembly binaries. After that, your C# code executes directly in the browser sandbox — no plugins, no extensions.
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