Apple gives you two ways to charge your iPhone: (1) the AC power adapter (one end plugs into dock connector at the bottom of you iPhone via the Provided USB cable, and the other end plugs into a standard household outlet), or(2) your iPhone will charge any time it's connected to your computer with the USB cable(one end plugs into the dock connector, and the other end plugs into the USB port on your computer).(Note:There are other charging solutions, like car chargers, but you have to buy those separately.) There is also a charging dock available from the Apple Store, which is nice because it stands you iPhone upright while it's charging(so you don't have to just lay your iPhone on a table) and offers an audio out plug to connect your iPhone to speakers or a stereo receiver, but other than that, there's no advantage to using the Dock over just plugging your iPhone directly into your computer(Whether you use the Dock, the AC Power adapter, or the USB cable by itself, they all work the same way. The only difference is, if you use the Dock, you plug the USB cable into the dock connector in the Dock, rather than the iPhone itself).
iTip: Charging via Your Computer
While you can charge your iPhone directly from the USB port on your computer, the battery may drain, not charge, when the computer goes to sleep or is in hibernation mode. You also may not get enough power if you connect your iPhone to a USB hub - it's usually best to connect it directly to your computer's built-in USB port.
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