Understanding the different of bicycle heaset.

Headset are normally category base bearing setup.
* Integrated Headset

The bearing are sealed, where  the bearing are press by an special tool.

* Internal Headset

Sounds the setup are similar to integrated, that the bearing cup hidden in the headtube, however the bearing cup and bearing can be separated each other.

* Standard headset

This headset is normally use on old bike. Where ball bearing cup seen one headtube.

For more reference see picture below.