VIVO is an enterprise class software system relying on numerous open source software components. Fundamentally, VIVO relies on Vitro (see below). VIVO adds a collection of ontologies (see Ontology Reference) to represent data about scholarship.
Vitro can be built an operated independently of VIVO. VIVO is completely dependent on Vitro.
VIVO is a customized Vitro. The table below shows how VIVO compares to Vitro.
VIVO, with Vitro, as "made" out of components, including other open source software components. The figure below shows the various software components that are used in a VIVO/Vitro system.