In the glossaries of ITIL V2 books, you'll find the definition:
"Service: One or my IT systems that enable a business process."
This suggests that a service is an IT system and viceversa which is hardly reasonable, in particular as it does not consider in any way the rather unruly and intricate service characteristics
s.
http://en.wikipedia.org/wiki/Service_(economics)#Service_characteristics
s.
http://www.learnmarketing.net/servicemarketing.htm
s.
http://busfac32.cob.calpoly.edu/presentations/Sharon_Dobson/Ch08.ppt
In fact,
a service is a set of singular and perishable benefits
- delivered from the accountable service provider, mostly in close coaction with his service suppliers,
- generated by functions of technical systems and/or by distinct activities of individuals, respectively,
- commissioned according to the needs of his service consumers by the service customer from the accountable service provider,
- rendered individually to an authorized service consumer at his/her dedicated trigger,
- and, finally, consumed and utilized by the triggering service consumer for executing and/or supporting his/her current day-to-day business task or private activity
http://en.wikipedia.org/wiki/Service_(economics)#Service_specification
Each service can be
clearly, completely and concisely specified by means of the
12 standard service attributes and appropriate attribute values.
s.
http://en.wikipedia.org/wiki/Service_(economics)#Service_specification