What is the iPhone app where you can scroll through apps?
It is called "App Store" and it lets you look through a list of all the apps that are available, and download apps.
What Do You Do if You Accidentally Delete an App From Your iPhone? iPhone users can choose from hundreds of thousands of iPhone Apps to augment their iPhone's capabilities. Each time you purchase an app from the App Store with your Apple account, Apple tracks the purchase. If you accidentally delete an app from your iPhone, you can restore the app from your computer or re-download it from the App Store free. Sync Each time…
Not in the same way as iphone. Iphone run their own separate opporating system and you can buy apps on the app store (accessable through itunes). Htc on the other hand run the Android opporating system (created by google). Simularly this has its own app store (the "Android Market") where you can download apps and games .etc.