The paper "What Is an Ontology?" by Nicola Guarino, Daniel Oberle, and Steffen Staab explores the different meanings of the term "ontology" across various communities. It distinguishes between the philosophical sense, which focuses on the nature and structure of reality, and the computational sense, which emerged in the knowledge engineering community. The authors revisit previous attempts to clarify and formalize the concept of an ontology, particularly the definition of an ontology as an "explicit specification of conceptualizations." They discuss the importance of shared explicit specifications and provide a detailed account of the notions of conceptualization and explicit specification. The paper also addresses the terminological issues in Computer Science, such as the use of terms like "concepts" and "relations," and proposes a philosophical term "universal" to resolve these conflicts.The paper "What Is an Ontology?" by Nicola Guarino, Daniel Oberle, and Steffen Staab explores the different meanings of the term "ontology" across various communities. It distinguishes between the philosophical sense, which focuses on the nature and structure of reality, and the computational sense, which emerged in the knowledge engineering community. The authors revisit previous attempts to clarify and formalize the concept of an ontology, particularly the definition of an ontology as an "explicit specification of conceptualizations." They discuss the importance of shared explicit specifications and provide a detailed account of the notions of conceptualization and explicit specification. The paper also addresses the terminological issues in Computer Science, such as the use of terms like "concepts" and "relations," and proposes a philosophical term "universal" to resolve these conflicts.