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Wikibase is a software powering and Data Items. It extends wikis with an additional database directly editable by editors.

Wikidata and Data Items are separate projects powered by the same software, similarly to how OSM Wiki and Wikipedia both use Mediawiki.

Note that

Consequently, the Q243 identifier may refer to the Data Item Key:dog or the Wikidata Item Eiffel Tower. It was suggested to change the first letter for each Wikibase installation to differentiate between them. However, this suggestion was declined by the Wikidata product manager, because each letter represents the type of entry. Apart from letter Q, there are also the letters P, L, F, S, E, and M representing properties, lexemes, forms, senses, entity schemas, and MediaInfo respectively.[1]