Ontology
study of the nature of being, becoming, existence or reality, as well as the basic categories of being and their relations (philosophy) / From Wikipedia, the free encyclopedia
Ontology is the philosophical study of the nature of being, becoming, existence, or reality. It is part of the major branch of philosophy known as metaphysics.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/e/ed/Parmenides.jpg/200px-Parmenides.jpg)
Ontology deals with questions about what things exist or can be said to exist, and how such entities can be grouped according to similarities and differences.