What is an iPod Touch or iPad?
An iPod Touch or iPad are portable media devices with wireless capability.

What is an "app"?
Review Apps: iEar     Giggle Apps
An app is short for the word application. Apps are programs that are downloaded to iPhone, iPods, and iPads through the iTunes Store on your computer or wirelessly through your mobile device (phone, iPod, iPad)

What do you mean when you say "sync"?
To sync is to transfer data through a wireless network, Bluetooth, texts, emails, or a cable from one location to another.