Wikidata is a document-oriented database, focusing on items, which represent any kind of topic, concept, or object. Each item is allocated a unique, persistent identifier, a positive integer prefixed with the upper-case letter Q, known as a "QID".

Wikidata is a free and open knowledge base that can be read and edited by both humans and machines.

Each Wikidata entity is identified by an entity ID, which is a number prefixed by a letter. items, also known as Q-items, are prefixed with Q (e.g. Q12345 ), properties are prefixed by P (e.g. P569 ) and.

The basic building blocks of Wikipedia are articles that are interlinked among each other. Wikidata [1] is, like Wikipedia, free and open, but instead of a collection of articles that are intended primarily to be read by humans, it is a knowledge base that is intended to be read and edited by humans and machines.