> For the complete documentation index, see [llms.txt](https://docs.snomed.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.snomed.org/snomed-international-documents/snomed-ct-glossary/s/snomed-ct-terminology-services.md).
# snomed ct terminology services
## SNOMED CT terminology services
A set of software functions that interface with and provide effective access to the content and features of one or more SNOMED CT editions.
#### Notes
* Each terminology service is a software function that interfaces with and provides access to information from one or more representations of a terminology.
* The software application that provides *SNOMED CT terminology services* is known as a SNOMED CT terminology server.
* While terminology services \_\_ may be applicable to several different terminologies, applications that provide *SNOMED CT terminology services,* should support access to the specific design features of SNOMED CT. These include the subtype hierarchy, description logic concept definitions, reference sets and expression constraints.
#### Examples
* Find a concept based on a set of search criteria. The criteria may include text to be matched against terms associated with the concept and constraints requiring a concept to be a subtype of an identified *concept* or a member of an identified reference set.
* Show the preferred term associated with an identified concept.
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