ITIL, formerly an acronym for Information Technology Infrastructure Library, is a set of practices for IT Service Management (ITSM) that focuses on aligning IT services with the needs of business.ollowing the passing an APMG/EXIn exam in IT service management (based on ITIL), some people will wear a metal pin on their shirt or jacket. This badge, provided by the ITSMF with basic gold color is set in the form of the ITIL-logo. The ITIL pins consist of a small, diamond-like structure.