What task does the Actor model perform in programming systems and what advantages does it provide?

The Actor model in programming systems is designed to organize parallel and distributed computations. In this model, an "actor" is an independent object that:

• Receives messages
• Processes them sequentially
• Can create new actors
• Sends messages to other actors

Advantages of the Actor model:

• State isolation: each actor manages its state, reducing concurrency issues.
• Simplified parallelism: actors process messages sequentially, simplifying synchronization.
• Scalability: well-suited for distributed systems.
• Resilience: failure of one actor does not crash the entire system.

In iOS, the Actor model is used, for example, in Swift Concurrency for safe state management in multithreaded environments.