Transferring documents between your iPad/iPhone/iPod touch and Mac/PC is a very simple and straightforward process. Apple has made it easy to do by implementing the functionality directly in iTunes.
Though the process may be simple, the interface to do so may not be immediately apparent to most users. The capability to transfer files to your device REQUIRES an application capable of having files transferred to it, such as Pages, Numbers, Goodreader, etc.
To open the interface for transferring files:
1. Connect your iPad/iPhone/iPod touch to your computer.
2. Open iTunes, if it didn’t open automatically when you connected your device.
3. Select your device in the left pane of iTunes, and select the Applications tab in the main window.
4. Scroll down to the bottom of the Applications tab, where you will see a list of applications capable of receiving documents on the left and an interface to transfer files on the right.
To transfer files from an application, simply select the application with the files you want and drag the files out of the right pane to wherever you would like them on your computer.
To transfer files to an application, click the add button in the right pane, navigate to the file you wish to transfer, and click open. Alternatively, you can drag and drop the file into the right pane. The file should now show up in the application on your device.