In compiler theory, an intrinsic function is a function available in a given language whose implementation is handled specially by the compiler. Typically, it substitutes a sequence of automatically-generated instructions for the original function call, similar to an inline function. Compilers that implement intrinsic functions generally enable them only when the user has requested optimization, falling back to a default implementation provided by the language runtime environment otherwise.
Quaestor has a large list of intrinsic functions that are dedicated to facilitate knowledge management as smooth as possible.
Additionally and very useful is the possibility in Quaestor to create your own 'intrinsic' functions on the basis of objects and relations you have created in your knowledge base. Read [Using Quaestor objects] how to create functions and work with objects.