What is the purpose of the Single Activity design pattern in application development?

The Single Activity template in Android development assumes that the entire application runs within a single Activity, and navigation between screens is implemented using fragments. This allows:

• Centralizing navigation and application state management.
• Simplifying data transfer between screens.
• Avoiding redundant creation and destruction of Activities, which improves performance.

Example: instead of creating a new Activity for each screen, the application switches between fragments within a single Activity using FragmentManager.