Before Joomla! 1.5, the so called Mambo-Joomla connection version, there were two separate process of creating a content item.
Remember the two Types of Content Items for the “Mambo-Joomla connection version? They were known as Static Content Item usually used for About Us and the “Duh” Content Item which is associated with Sections and Categories …
Create a Static Content Item? (About us | Mission Vision | Permanent Information
Create “Duh!” Content Item? (Ever changing contents, company updates)
With Joomla 1.5, the two entities have been combined. No more Static and no more “Duh” Content Item.