What are the key differences between server-side and client-side Blazor and when would you choose one over the other for building a web application?

When considering the differences between server-side and client-side Blazor for building web applications, it's important to understand their distinct features and strengths.

**Server-side Blazor:**
- Server-side Blazor runs on the server and utilizes SignalR to establish a real-time connection with the client's web browser.
- The rendering of the UI components is performed on the server side, reducing the amount of code sent to the client.
- Communication between client and server is optimized as UI updates are handled by the server.
- Suitable for applications that require a high level of security or need to interact with databases and other server-side resources.

**Client-side Blazor:**
- Client-side Blazor runs on the browser using WebAssembly, enabling developers to build interactive single-page applications.
- The entire application is downloaded to the client's browser and runs independently, allowing for offline capabilities.
- Offers a faster initial load time and responsiveness as the client handles UI updates.
- Ideal for applications that prioritize a rich user experience and interactivity without relying heavily on server-side resources.

**Choosing between server-side and client-side Blazor depends on various factors such as:**
- **Performance**: If your application requires high performance, client-side Blazor may be a better choice due to its ability to run independently on the client.
- **Security**: For applications with sensitive data or authentication requirements, server-side Blazor could be more secure as most operations are handled on the server.
- **Offline Capabilities**: If offline functionality is crucial, client-side Blazor's ability to run independently on the client without constant server connection may be preferred.
- **Interactivity**: If your application needs real-time updates and dynamic user interactions, client-side Blazor's responsiveness may be more suitable.

In conclusion, server-side Blazor is ideal for applications that demand security and server-side processing, while client-side Blazor excels in providing a rich user experience, offline capabilities, and interactivity. Ultimately, the choice between the two depends on the specific requirements and objectives of the web application being developed.