Context and Scope

Business Context

Subsystem	Responsibility
Wikibase Repository	Data Repository
Wikibase Client	Access view MediaWiki to a Data Repository
Query Service	Graph representation of Wikibase data with a SPARQL interface
Query Service UI	User interface for a SPARQL interface
Elastic Search	Indexes MediaWiki / Wikibase for search pourposes
Wikimedia Commons	A source of media files for Wikibase
Quickstatements	A tool enabling mass editing of Wikibase Entities

Technical Context

Draft expansive context

You may find that the individual Wikibase Repository and Wikibase Client components documentations are more helpful

Wikibase extensions, containing Wikibase Repository, Wikibase Client and more.