ITIL (Information Technology Infrastructure Library) is not a manual document, but rather a comprehensive set of best practices for IT service management (ITSM). ITIL provides guidance on how to align IT services with the needs of the business and deliver value to customers.
ITIL consists of a series of publications, processes, and practices that organizations can adopt to improve their IT service management capabilities. These publications cover a wide range of topics, including service strategy, service design, service transition, service operation, and continual service improvement.
While the ITIL framework has traditionally been documented in physical books, it is also available in digital formats and online resources. The most recent version of ITIL is ITIL 4.