Managed Object Context
The managed object context (NSManagedObjectContext) is a working area for managed objects. To create a new object, delete an object, or query existing objects, the app interacts with the managed object context. In addition, the managed object context can manage related changes. For example, the app could insert a few objects, update some objects, delete an object, and then save all those changes together or even roll them back if they are not needed.
More than one managed object context can be used at the same time to separate or confine work. Imagine that an app needs to display a set of data while it is importing some new data from a Web service. In that case, one managed object context would be used in the main thread ...
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