The full life cycle of IT services refers to the complete process of managing and delivering IT and business services within an organization. It encompasses all stages, from initial planning and design of applications to implementation, IT operation, and finally continuous improvement and retirement. By following the full life cycle of IT services, organizations can ensure that their IT services are designed, implemented, secured, and managed effectively to meet the evolving needs of the business, deliver value to customers, and drive continuous improvement in their IT operations.