"FaceTime is Apple's video chat service. It allows anyone with a recent iPhone, iPod touch, iPad, or Mac to make free calls to any other Apple user over Wi-Fi or cellular connection. On the iPhone, FaceTime is bundled into the Phone app. On the iPod touch, iPad, and Mac, FaceTime is a separate app. On all devices, FaceTime can connect to any Apple-registered iPhone phone number or email address. That makes it perfect for keeping in touch with family who lives far away, with the kids while traveling, with business partners at distant offices, or even with that special someone while shopping for the perfect gift."
Via John Evans