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Lesson 6, “Data Serialization,” covers how to write data out to disk, send data up to a network service or web service, or receive data from a web service, all of which require serialization. First, viewers learn how to use the NSCoding protocol in objects to serialize custom objects and write them out to a disk. Next, viewers learn about property lists which store Dictionaries and arrays easily. Finally, viewers are shown the JSON serializer, which is a new addition to Objective-C. Using this system framework, developers can convert objects into correctly formed JSON strings and vise versa.