What is the purpose of using a reference counter when declaring variables with the unowned attribute in memory management?

In iOS, when using ARC (Automatic Reference Counting), the unowned attribute is used to declare a weak reference that does not increase the object's reference count. The goal is to avoid strong reference cycles that lead to memory leaks.

The reference count tracks how many strong references an object has. unowned does not increase this count, but the reference is guaranteed not to be nil during use. If the object is deallocated, accessing the unowned reference will cause a runtime error.

Thus, the reference count helps manage the object's lifetime, and unowned allows referencing the object without increasing this count, preventing retain cycles.