# Concepts and Concept Queries

- [Concepts](/platform/wemmodeler/concepts-and-concept-queries/concepts.md): An introduction to the WEM Modeler Ontology and use of Concepts.
- [Concept Queries](/platform/wemmodeler/concepts-and-concept-queries/concept-queries.md): Advanced custom queries with the WEM Ontology tools
- [Concept Relations](/platform/wemmodeler/concepts-and-concept-queries/concept-relations.md): About defining your custom Relations between Concepts and using them