According to Techopedia:

An ontology can be a representation of related ideas within a specific sector that defines the links between those ideas. The sector can be used to study and evaluate the existence of things within a specific sector and can be used to define the sector itself.

In the sense of computing, an ontology acts as a structural representation, used to systematically organize info and concepts in segements such as AI, semantics, and biomedical and info architecture.

https://www.techopedia.com/definition/591/computer-ontology

https://gsi-upm.github.io/sematch/