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In Wikidata, items are used to represent all the things in human knowledge, including topics, concepts, and objects. For example, the "1988 Summer Olympics", "love", "Elvis Presley", and "gorilla" are all items in Wikidata.

For those who are familiar with Wikipedia, it may be tempting to initially think of items as like the Wikidata version of Wikipedia articles. While items and articles are both pages for storing information about different concepts or topics of human knowledge, it's important to keep in mind that Wikidata is not just a database of Wikipedia content. In fact, Wikidata is actually more similar to Wikimedia Commons, the media file repository, than it is to Wikipedia—but instead of media files, Wikidata provides centralized storage for access to structured data for all Wikimedia projects, as well as for use on external websites.

There are a few important characteristics about items that contribute to the success of Wikidata:

Wikidata items are said to be notable. This means at least one of three things:

• a corresponding page on a Wikimedia site such as Wikipedia, Wikivoyage, Wikisource, Wikiquote, Wikiversity, or Wikimedia Commons,
• a clearly identifiable conceptual or material entity that can be described using serious and publicly available references or
• the item fulfills a structural need. For more information look at our notability policy.

Items are also unique. Each item should represent a clearly identifiable concept or object, or an instance of a clearly identifiable concept or object. For example, in Wikidata we can have items for both the concept of planet (Q634) and an instance of a planet, Earth (Q2).

Items can and should also be linked to each other. Each item has a unique identifier (starting with a Q prefix) and its own page in the Wikidata main namespace. For example, for the items listed above, 1988 Summer Olympics (Q8470), love (Q316), Elvis Presley (Q303) and Gorilla (Q36611) are the respective item pages. These pages are where all the data for each item is added, edited, and maintained, mostly in the form of statements.

Pages also allow items to be linked together so that all the data on Wikidata can be interconnected. A link to another page is usually added as a "property" by clicking on "edit" in the "statements" section. If no appropriate property is listed yet, it can be added by clicking on "+ add" on the bottom of the "statements" section. See: #Adding to an existing item page.

Typical properties to link one item to another:

• Comparing items ...
  • said to be the same as (P460)
  • different from (P1889) - (different from, but sometimes confused with ...)

• Item is part of ...
  • part of (P361) - (section of .../ contained within .../ pieces of ...)
  • instance of (P31) - (is an example of ...)
  • subclass of (P279) - (is a subset of ...)
  • facet of (P1269) - (aspect of .../ subitem of .../ a broader perspective on the same topic is offered by ...)
  • has characteristic (P1552) - (has characteristic .../ defining feature .../ inherent property ...)

• Item contains ...
  • has part(s) (P527) - (contains ...)
  • has part(s) of the class (P2670) (has parts that are instances of .../ some parts form subclass of ...)

Example:

1. Albert Einstein's brain (Q2464312) is part of (P361): Albert Einstein (Q937).
2. Albert Einstein (Q937) is an instance of (P31): human (Q5).
3. human (Q5) is a subclass of (P279): mammal (Q7377).
4. mammal (Q7377) has part(s) (P527): mammary gland (Q189961).

Outside of item pages links to items can usually be placed by adding the prefix "Q|" to the item number and enclosing it in curly brackets, e.g.: {{Q|8470}} → 1988 Summer Olympics (Q8470)

The item by title search page has two entry fields that are designed for searching for items that already have a page on a Wikimedia site and may be in the Wikidata system. The left field, which says "Site:" is where you put the language of the Wikimedia site page that corresponds to the item you want to add. Most Wikimedia sites have equivalent editions for different languages which are represented by a code. For example, the code for English language is en and the code for French language is fr. This code can be found in the URL; so en.wiktionary.org is the English Wiktionary and en.wikipedia.org is the English Wikipedia, while fr.wiktionary.org is the French Wiktionary and fr.wikipedia.org is the French Wikipedia. A screenshot that shows where to locate a language code for a Wikimedia site is available here.

For the second field, "Page:", you must put in the exact title of the page as it appears at the top of the page on its Wikimedia site. This is important for retrieving the right item because there may be multiple items with the same label in Wikidata. For example, if you wanted to know if there was already an item page for capital (the concept referring to non-financial assets) in Wikidata, you must search "capital (economics)"—the title of the page on Wikipedia—and not "capital" which would instead give you the item page for the Wikipedia disambiguation page on capital.

When Wikidata already has a page on that item, the search will take you to that page.

A label is the most common name that an item would be known by. Labels are added to the text fields at the top of an item page to the "Label" column. Click "edit", type in the label, and click "publish". A description is a short phrase designed to disambiguate the page in question from other pages with the same or similar labels. Descriptions are added in the same way as labels, to the "Description" column. See Help:Label and Help:Description for more on using labels and descriptions.

Please note: When clicking on any "edit" or "+ add" before the page has fully loaded you might be taken to a separate page with a special interface. This will also let you make the intended changes but it is more difficult to use. If the page does not appear as depicted on the images to the right after clicking "edit" or "+ add" you might want go back, wait for the browser to finish loading the page (usually there is an indication on top of the browser's tab) and then click "edit" or "+ add" again.

Examples of four fields filled out for the item Marie Curie (Q7186)

The template {{Item documentation}} provides documentation for items. It can be added in the talk page of an item. See Talk:Q56061 for an example for administrative territorial entity (Q56061).

Only admins can delete items. Deletions are done via Wikidata:Requests for deletions. Please give a short reason.

Wikidata:Sandbox -- This is a sandbox for testing changes to items.

For related Help pages, see:

• Project chat, for discussing all and any aspects of Wikidata
• Wikidata:Glossary, the glossary of terms used in this and other Help pages
• Help:FAQ, frequently asked questions asked and answered by the Wikidata community
• Help:Contents, the Help portal featuring all the documentation available for Wikidata