I  am often asked what the differences are between an ontology and a taxonomy. They are often used interchangeable, but what is the real difference? A taxonomy is a classification of things in a certain domain.An ontology describes the world. Some people think of it as putting the universe in a bottle. Look at the following example: TAXONOMY: Cats     Related term: Housepets     Narrower term: tabby cat, black cat, kitten     Broader term: Housepets [...]