Explain the differences between synchronous and asynchronous programming in your preferred language. How do each of these types of flows affect application performance and user experience? Can you provide examples of when you would use asynchronous programming?

Synchronous programming blocks the execution flow until a task completes, which can lead to performance bottlenecks, particularly in I/O operations. Asynchronous programming allows the execution to continue while waiting for tasks to complete, often improving responsiveness and resource utilization. For example, in web applications where API calls are made, using asynchronous patterns can significantly enhance user experiences by providing quick feedback versus a frozen UI.