You can't delete it per se but you can disable and hide it.
Go to Settings -> General -> Restrictions
Tap Enable Restrictions
Enter a passcode twice
Disable any of the listed apps or content.
You can't delete the Nike app because it comes with the iphone.
There is a 'Delete all' button on the History Page!
youtube
if is the one that came with the iphone you cant... sadly you can't because the apple designers made it impossible to delete
youtube
Both YouTube and Truveo have dedicated iPhone video applications.
The way to delete a Smule account is to delete the application from the android or iPhone device. There are several different applications the Smule owns. It would depend on which application for the proper way on how to delete just one account.
tap and hold the application like on an ipod or iphone and click the bubble with the tree dots in it. Then it gives you the option to delete it.
you have to delete your email account to delete your youtube channel. and you have to delete your youtube account too.
To delete clone applications on your iPhone, press and hold the app icon on the home screen until a menu appears, then select "Remove App." Tap "Delete App" and confirm the deletion. Alternatively, you can go to Settings > General > iPhone Storage, find the app in the list, and tap "Delete App" from there. This will permanently remove the cloned application from your device.
if is one of the factory installed apps like maps and stocks app they cant be deleted
if you mean developement as in generations of iphones, then: 2008---- iphone 2g 2009---- iphone 3g 2009---- iphone 3gs 2010---- iphone 4 and if you mean application development (well paid job) then look it up on youtube...