C#: What is the difference between Blazor Server and Blazor WebAssembly?

Blazor Server — server-side rendering. Blazor WebAssembly — client-side.

Blazor Server:

• Runs on server.
• SignalR.
• Smaller download.

Blazor WebAssembly:

• Runs in browser.
• WASM.
• Larger download.
• Offline capable.

1// Blazor Server
2builder.Services.AddServerSideBlazor();
3
4// Blazor WebAssembly
5builder.Services.AddBlazorWebAssembly();

Key: Server for small download, WASM for offline.