Can You Delete Single APP Data From an IPhone?

Sorry for the confusing question but, I was wondering, you know how If you reset your whole IPhone, It deletes all your Data, etc… Completely! Well… If I went into my IPhone Settings, and clicked on the APPS, where it says Documents and Data if I click underneath it, Delete APP will it wipe the Data? Any help would be amazing!

You can do it that way - it'll delete the app and its associated data.

Ever simpler, just tap and hold the app icon until they all wobble then tap the little red x on the icon and the phone will delete the app and all of its associated data.

You can always go to the app store and download it again if you decide you want it back. You don't pay for the app a second time if you're using the same Apple ID. You don't get any of the data back though, it's like getting the app for the first time.