Ontology is the study of being.
“It is the branch of philosophy that investigates the nature of existence, the features all entities have in common, and how they are divided into basic categories of being.
It aims to discover the foundational building blocks of the world and characterize reality as a whole in its most general aspects.
In this regard, ontology contrasts with individual sciences like biology and astronomy, which restrict themselves to a limited domain of entities, such as living entities and celestial phenomena.”