ITIL is an acronym used for Information Technology Infrastructure Library. ITIL is a string of references (books and courses), which summarizes top procedures for IT (information technology) management.Over a thousand of organizations situated from different parts of the world utilize the ITIL. As a result, ITIL has been an excellent reference used by departments involved in IT.hat makes ITIL successful in helping IT managers, is its detailed and complete depictions, checklists, and courses of action that are considered customizable to provide for a specific IT organization’s needs. In the United Kingdom, 31 volumes of ITIL were initially published between the years 1985 to 1995.