Thanks to the shift to Lightning connectors, iPads are now split between the world of 30-pin and Lightning accessories and charging cables. For iPads that are older, or for older accessories and chargers, Apple sells two versions of 30-pin-to-Lightning adapters: one a tiny plug ($29), the other a longer cable ($39). Both can be used for charging, syncing, and data transfers like SD card camera importing, but not for video output. Third parties are selling less expensive options on sites on Amazon, thankfully, because $30 and $40 is a lot to pay for a dongle...but we haven't vetted those out here yet. You only need one of these if you have older iPad accessories you don't want to part with. For many, getting a Lightning-to-Micro-USB adapter ($19) might make a lot more sense.