Ways to get data from the internet with XCode and Objective-C

Hey guys,
Thanks in advance for any help. I was simple wondering what the best ways are to get data from the internet to use in an application. For example, is it best to store the data in a MySQL database with PHP and then use C code and MySQL commands to get that data from my Mac app? Is JSON better? Any help would be awesome!
Josh

What kind of data are you after?
Eric

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