What are differences between manual and automatic reference counting ios

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Automatic Reference Counting eliminates many of the manual reference counting issues that ultimately resulted in iOS apps that would crash here and there, Automatic Reference Counting ensures a class instance isn't deallocated as long as a property, constant, or variable keeps a strong reference to the class ARC differs from tracing garbage collection in that there is no background process that deallocates the objects asynchronously at runtime. Unlike tracing Reference counting applies only to instances of classes. Structures and enumerations are value types, not reference types, and aren't stored and passed by Automatic Reference counting or ARC, is a form of garbage collection in which objects are deallocated once there are no more references to them, i.e. no other One of the most significant differences in the Elements languages between .NET and Java on the one side and Cocoa on the other is the use of Garbage Collection