Types of Databases - Object Oriented
The final type of database is called an Object Oriented Database. These databases draw relationships and hierarchies between data, but they cheat a little bit by utilizing objects and classes as ways of redefining the same data.
Image class hierarchies as "kinds" and objects hierarchies as "parts" ... eg. A patient is a kind of person and the object John Doe's height in centimetres is a part of the object John Doe.