ITIL addresses six topics: Service Support; Service Delivery; Planning to Implement Service Management; ICT Infrastructure Management; Applications Management; The Business Perspective.
Overall, it is essentially a representation of best practice for IT service management, comprising a series of books and information which provide guidance on the quality provision of IT services.
IT Service Management (ITSM) itself is generally divided into two main areas, Service Support and Service Delivery. Together, these two areas consist of 12 disciplines that are responsible for the provision and management of effective IT services.
The following topics are explored in greater depth on their own pages: