ITIL® is an IT service management framework that provides guidance on the full life cycle of defining, developing, managing, delivering and improving IT services. ITIL® is a Registered Trade Mark of AXELOS Limited. It is structured as five core books (Service Strategy, Service Design, Service Transition, Service Operation and Continual Service Improvement) and other supplementary publications. SummaryArticle NameITILGartner, Inc.Gartner, Inc.DescriptionITIL (formerly known as the Information Technology Infrastructure Library) is an IT service management framework that provides guidance on the full life cycle of defining, developing, managing, delivering and improving IT services.