The Dojo toolkit is also known simply as Dojo.
Techopedia explains Dojo Toolkit
Components of the Dojo toolkit are:
Core — This component contains the central and non-visual modules.
Dijit — This is a widget and layout library for the user interface.
Dojox — This component consists of experimental modules that are not yet stable enough to be included in Dojo and Dijit.
Util — This component contains build tools for style checking, automation, optimization and documentation.