A little language, that helps in a particular application domain.  

A more formal definition from the DSLAnnotatedBibliography: _A domain-specific language (DSL) is a programming or executable specification language that offers, through appropriate notations and abstractions, expressive power focused on, and usually restricted to, a particular problem domain._

This raises the question WhatIsADomain, which is partly answered by the field of DomainEngineering.
 
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Lots of references on domain-specific languages can be found in the DSLAnnotatedBibliography, which you can extend with DSLBibliographyAdditions.

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Resources include:
	* The DSL project run at CWI, see http://www.cwi.nl/projects/dsl
	* The DSL project run by the Compose Group. The site at http://compose.labri.u-bordeaux.fr/documentation/dsl/ includes a general overview of DSLs. 
	* DslConferences
  
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CategoryEntryPoint | CategoryDSL | Contributions by ArieVanDeursen