Difference between ios function and manipulators?

1. iOS functions returns value while manipulators does not.

2.we can not create own iOS functions while we can create our own manipulators.

3.iOS functions are single and not possible to be combined while manipulators are possible to be applied in chain.

4.iOS function needs <iOStream> while manipulators needs <iomanip>

5.iOS functions are member functions while manipulators are non-member functions.