Wikipedia 10K Redux by Reagle from Starling archive. Bugs abound!!!

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The most recognizably metaphysical branch of MetaPhysics, ''ontology'' is the study of existence in general, or in AristotlE'''''s memorable phrase, the study of ''BeingQuaBeing.''  So ontology is the study of existing things insofar as they exist, or as to the aspect of ExistEnce.

While perhaps there's not any one thing such obscure phrases must mean, what they have come to mean is the study of the most basic CategoriesOfBeing--and of "NonBeing" as well.  (MeinonG was an ontologist.)  A "category of being" is a type or class of "ThinG," ''thing'' being used in its broadest possible sense, that cannot be reduced to (see ReductioN) or explicated (see ExplicatioN) in terms of any other category.  Among the many and varied categories that have been postulated over the millennia, some perennial favorites are ObjectS (presumably, PhysicalObjects), UniversalS, PropertieS, RelationS, EventS, TheMind (or something mental), and SeT''''s.

What it means to take, for example, the category ObjectS seriously as a CategoryOfBeing is to assert that the concept of objecthood cannot be reduced to or explained in any other terms--not, for example, in terms of bundles of properties.  As it turns out, very many controversies of OntOlogy can be understood as controversies about exactly which categories should be regarded as the (fundamental, irreducible, primitive) CategoriesOfBeing.

The ontological problems ''par excellence'' include:
* What is ExistencE?
* Is ExistencE is a property?
* The ProblemOfUniversals
* Are ObjectS ultimately bundles of properties or instead SubstancE''''s?
There are, however, very many more ontological problems than these; but many of the problems begin with these problems.