Graph

The graph for an ontology or ontology library shows ontologies as nodes and mappings as edges. Typically, the graph shows all the imported ontologies, but it can also contain other kinds of mappings.

Ontohub graph page, for example this one
By clicking on nodes and edges, you can obtain more details about the respective ontologies and mappings. You can restrict the shown mappings to import mappings (see the mappings page for more information). Also, you can select a radius that determines how much of the graph is shown.