What is the role of dispatching in the system and why is it necessary?

Dispatching in a system is the process of selecting and invoking a specific handler or method depending on the context or data type at runtime.

In iOS, for example, dispatching is used to manage the execution of tasks across different threads or queues (such as through Grand Central Dispatch). This allows for efficient load distribution, interface responsiveness, and operation synchronization.

Why dispatching is necessary:

• Allows tasks to be performed asynchronously without blocking the main thread
• Ensures the correct order and priority of task execution
• Improves application performance and responsiveness

Example: a UI update should be called on the main thread, while heavy computations should be performed in the background; dispatching helps organize this correctly.