Why use ITIL?

The ITIL structure is broken down into several stages, which are then broken down into more than two dozen ITIL processes. Following is a summary:
Structure for ITIL®
The ITIL framework’s five service lifecycle phases are:
Service Transition Service Approach Designing and delivering services
Consistently Excellent Service (CSI)
The subsequent 26 ITIL processes are then broken down into the following stages:

ITIL® Procedures
The five service lifecycle stages are divided up into the 26 ITIL processes.
Service Concept: the following is managed: Demand, the Service Portfolio, the Financial Situation, and the Business Relationship
Creating Services: Administration of Service Level, Availability, Information Security, and Service Catalog