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((Short description|Information repository with multiple applications))
((Use dmy dates|date=February 2021))
((more citations needed|date=June 2014))

In [[computer science]], a '''knowledge base''' ('''KB''') is a set of sentences, each sentence given in a [[Knowledge representation and reasoning|knowledge representation language]], with [[Interface (computing)|interfaces]] to tell new sentences and to ask questions about what is known, where either of these interfaces might use [[inference]].<ref>((Cite book |last1=Russell |first1=Stuart J. |author-link1=Stuart J. Russell |chapter=Knowledge-based agents |title=Artificial intelligence: a modern approach |date=2021 |others=[[Peter Norvig]], Ming-Wei Chang, Jacob Devlin, Anca Dragan, [[David Forsyth (computer scientist)|David Forsyth]], [[Ian Goodfellow]], [[Jitendra Malik]], Vikash Mansinghka, [[Judea Pearl]], Michael J. Wooldridge |isbn=978-0-13-461099-3 |edition=Fourth |location=Hoboken, NJ |publisher=Pearson |oclc=1124776132))</ref> It is a technology used to [[information storage|store]] complex [[structured data]] used by a [[Computer|computer system]]. The initial use of the term was in connection with [[expert systems]], which were the first [[knowledge-based systems]]. 

==Original usage of the term==
The original use of the term knowledge base was to describe one of the two sub-systems of an [[expert system]]. A [[Knowledge-based systems|knowledge-based system]] consists of a knowledge-base representing facts about the world and ways of [[Reasoning system|reasoning]] about those facts to deduce new facts or highlight inconsistencies.<ref name="hayes">((cite book |last=Hayes-Roth |first=Frederick |title=Building Expert Systems |year=1983 |publisher=Addison-Wesley |isbn=0-201-10686-8 |author2=Donald Waterman |author3=Douglas Lenat |url-access=registration |url=https://archive.org/details/buildingexpertsy00temd ))</ref>

==Properties==
The term "knowledge-base" was coined to distinguish this form of knowledge store from the more common and widely used term ''[[database]]''. During the 1970s, virtually all large [[management information systems]] stored their [[data]] in some type of [[Hierarchical database model|hierarchical]] or [[Relational database|relational]] [[database]]. At this point in the history of [[information technology]], the distinction between a database and a knowledge-base was clear and unambiguous.

A database had the following properties:

* [[Attribute–value system|Flat data:]] Data was usually represented in a tabular format with strings or numbers in each field.
* Multiple users: A conventional database needed to support more than one user or system logged into the same data at the same time.
* [[Database transaction|Transactions]]: An essential requirement for a database was to maintain integrity and consistency among data accessed by [[concurrent user]]s. These are the so-called [[ACID]] properties: Atomicity, Consistency, Isolation, and Durability.
* Large, long-lived data: A corporate database needed to support not just thousands but hundreds of thousands or more rows of data. Such a database usually needed to persist past the specific uses of any individual program; it needed to store data for years and decades rather than for the life of a program.

The first knowledge-based systems had data needs that were the opposite of these database requirements. An expert system requires [[Data model|structured data]]. Not just tables with numbers and strings, but pointers to other objects that in turn have additional pointers. The ideal representation for a knowledge base is an object model (often called an [[Ontology (information science)|ontology]] in [[AI|artificial intelligence]] literature) with classes, subclasses and instances.

Early expert systems also had little need for multiple users or the complexity that comes with requiring transactional properties on data. The data for the early expert systems was used to arrive at a specific answer, such as a medical diagnosis, the design of a molecule, or a response to an emergency.<ref name="hayes"/> Once the solution to the problem was known, there was not a critical demand to store large amounts of data back to a permanent memory store. A more precise statement would be that given the technologies available, researchers compromised and did without these capabilities because they realized they were beyond what could be expected, and they could develop useful solutions to non-trivial problems without them. Even from the beginning, the more astute researchers realized the potential benefits of being able to store, analyze, and reuse knowledge. For example, see the discussion of Corporate Memory in the earliest work of the [[Knowledge Based Software Assistant|Knowledge-Based Software Assistant]] program by [[Cordell Green]] et al.<ref>((cite journal |last=Green|first=Cordell|author2=D. Luckham |author3=R. Balzer |author4=T. Cheatham |author5=C. Rich |title=Report on a knowledge-based software assistant|journal=Readings in Artificial Intelligence and Software Engineering |year=1986 |pages=377–428 |url = http://dl.acm.org/citation.cfm?id=31893 |access-date=1 December 2013|publisher=Morgan Kaufmann |doi=10.1016/B978-0-934613-12-5.50034-3|isbn=9780934613125 ))</ref>

The volume requirements were also different for a knowledge-base compared to a conventional database. The knowledge-base needed to know facts about the world. For example, to represent the statement that "All humans are mortal", a database typically could not represent this general knowledge but instead would need to store information about thousands of tables that represented information about specific humans. Representing that all humans are mortal and being able to reason about any given human that they are mortal is the work of a knowledge-base. Representing that George, Mary, Sam, Jenna, Mike,... and hundreds of thousands of other customers are all humans with specific ages, sex, address, etc. is the work for a database.<ref>((cite book |last=Feigenbaum|first=Edward|title=The Fifth Generation: Artificial Intelligence and Japan's Computer Challenge to the World |url=https://archive.org/details/fifthgeneration00feig|url-access=registration|year=1983|publisher=Addison-Wesley|location=Reading, MA|isbn=0-201-11519-0|page=[https://archive.org/details/fifthgeneration00feig/page/77 77]|quote=Your database is that patient's record, including history... vital signs, drugs given,... The knowledge base... is what you learned in medical school... it consists of facts, predicates, and beliefs...))</ref><ref>((cite book|last=Jarke|first=Mathias|title=Logic, Databases, and Artificial Intelligence|chapter-url=http://www.dfki.de/~wahlster/Publications/KBMS_Requirements_of_Knowledge-Based_Systems.pdf|year=1978|publisher=Springer|location=Berlin|chapter=KBMS Requirements for Knowledge-Based Systems|access-date=1 December 2013|archive-date=22 June 2013|archive-url=https://web.archive.org/web/20130622070719/http://www.dfki.de/~wahlster/Publications/KBMS_Requirements_of_Knowledge-Based_Systems.pdf|url-status=live))</ref>

As expert systems moved from being prototypes to systems deployed in corporate environments the requirements for their data storage rapidly started to overlap with the standard database requirements for multiple, distributed users with support for transactions. Initially, the demand could be seen in two different but competitive markets. From the [[Artificial intelligence|AI]] and [[Object-oriented programming|Object-Oriented]] communities, [[Object database|object-oriented databases]] such as [[Versant Object Database|Versant]] emerged. These were systems designed from the ground up to have support for object-oriented capabilities but also to support standard database services as well. On the other hand, the large database vendors such as [[Oracle Corporation|Oracle]] added capabilities to their products that provided support for knowledge-base requirements such as class-subclass relations and rules.

==Internet as a knowledge base==
The next evolution for the term "knowledge-base" was the [[Internet]]. With the rise of the Internet, documents, [[hypertext]], and multimedia support were now critical for any corporate database. It was no longer enough to support large tables of data or relatively small objects that lived primarily in computer memory. Support for corporate web sites required persistence and transactions for documents. This created a whole new discipline known as [[Web Content Management]].

The other driver for document support was the rise of [[knowledge management]] vendors such as [[HCL Notes]] (formerly Lotus Notes). [[Knowledge management|Knowledge Management]] actually predated the Internet but with the Internet there was great synergy between the two areas. Knowledge management products adopted the term "knowledge-base" to describe their [[Repository (version control)|repositories]] but the meaning had a big difference. In the case of previous knowledge-based systems, the knowledge was primarily for the use of an automated system, to reason about and draw conclusions about the world. With knowledge management products, the knowledge was primarily meant for humans, for example to serve as a repository of manuals, procedures, policies, best practices, reusable designs and code, etc. In both cases the distinctions between the uses and kinds of systems were ill-defined. As the technology scaled up it was rare to find a system that could really be cleanly classified as knowledge-based in the sense of an expert system that performed automated reasoning and knowledge-based in the sense of knowledge management that provided knowledge in the form of documents and media that could be leveraged by humans.<ref>((cite book|last=Krishna|first=S|title=Introduction to Database and Knowledge-base Systems|year=1992|publisher=World Scientific Publishing|location=Singapore|isbn=981-02-0619-4))</ref>

==See also==<!-- Please respect alphabetical order -->
((div col))
* [[Content management]]
* [[Database]]
* [[Enterprise bookmarking]]
* [[Information repository]]
* [[Knowledge-based system]]
* [[Knowledge graph]]
* [[Knowledge management]]
* [[Microsoft Knowledge Base]]
* [[Diffbot]]
* [[Ontology engineering]]
* [[Semantic network]]
* [[Symbolic artificial intelligence]]
* [[Text mining]]
* [[Vadalog]]
* [[Wikidata]]
* [[YAGO (database)|YAGO]]
((div col end))

==References==
((Reflist))

==External links==
((Scholia|topic))
((Semantic Web))
((Authority control))

((DEFAULTSORT:Knowledge Base))
[[Category:Technical communication]]
[[Category:Knowledge bases| ]]


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