All 15 Blazor (Server & WebAssembly) questions
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How does Blazor Server's reliance on a persistent SignalR connection affect its behavior under network interruptions? How do Razor components (.razor files) combine markup and C# code, and what is the @code block? What are Blazor component lifecycle methods, and what is the purpose of OnInitializedAsync versus OnParametersSetAsync? How do you call JavaScript from C# code in Blazor (JS interop), and when is it necessary? How does dependency injection work in Blazor components, and what's the difference between @inject and constructor injection? How does Blazor handle routing, and what does the @page directive do? How does Blazor WebAssembly's initial load performance compare to Blazor Server, and what techniques mitigate WASM's larger download size? How do you pass data from a parent component to a child component in Blazor using [Parameter]? What is a 'circuit' in Blazor Server, and how does server-side state management work across it? How does two-way data binding work with @bind in Blazor, and how can you customize the triggering event?
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.NET › Blazor (Server & WebAssembly)

What is Blazor, and what are the two primary hosting models (Server and WebAssembly)?

Beginner

Answer

Blazor is a framework for building interactive web UIs using C# and .NET instead of JavaScript. Blazor Server runs application logic on the server, with the browser maintaining a persistent SignalR connection that relays UI events up and DOM updates down as lightweight diffs. Blazor WebAssembly (WASM) instead downloads the .NET runtime and app assemblies to the browser, executing entirely client-side, with no ongoing server connection required for UI logic.
// Program.cs for Blazor Server
builder.Services.AddRazorComponents().AddInteractiveServerComponents();

// Program.cs for Blazor WebAssembly (client project)
var builder = WebAssemblyHostBuilder.CreateDefault(args);
builder.RootComponents.Add<App>("#app");
Real-world example An internal admin tool with users on a reliable corporate network chooses Blazor Server for its fast initial load and simpler debugging, while a public-facing app needing offline capability chooses Blazor WebAssembly instead.

Common follow-ups: What is Blazor United / Auto render mode and how does it combine both models?;What are the latency implications of Blazor Server's SignalR dependency?

SignalR & Real-Time Communication;ASP.NET Core Middleware & Request Pipeline
All 15 Blazor (Server & WebAssembly) questions