What is ITIL? Everything You Need to Know

ITIL is a set if best practices, processes, guidelines, and guidelines to deliver IT services to customers. The goal is to improve the value of the service for customers or businesses and to align it with business needs and requirements. ITIL provides detailed descriptions of processes, flows, success metrics, and transformation guidelines that can be adapted by organizations to fit their environment.
Information Technology Infrastructure Library is not a prescriptive tool. It does not dictate how much or what kind of framework must be used. This allows the organization to implement as many processes as they need to meet their specific needs. Each process is recognized as having value to the company and can be implemented independently.

Information Technology Infrastructure Library has four major revisions. ITIL 2011 is the most recent version. All revisions were based on feedback and suggestions from a large community of practitioners and consultants. ITIL was reduced to five phases over the life-cycle following the circular pattern in the third revision. These phases are:
Service Strategy – This stage is where the company aligns the IT Department with its core business. The Service Strategy focuses on understanding the needs, requirements, and direction. This phase includes the following major processes: Strategy Management for IT Services; Service Portfolio Management; Financial Management for IT Services; Demand Management and Business Relationship Management.
Service Design – This stage focuses on designing services that will be provided to customers. This stage focuses on the transformation of services into a detailed Service description. Service Design consists 11 major processes: Design Coordination; Service Catalogue Management; Service Level Management; Capacity Management; IT Service Continuity Management; Information Security Management; Supplier Management, Risk Management. Compliance Management. Architecture Management.
Service Transition – This phase is responsible for moving the service from the development stage into the operations stage. This phase focuses on the delivery and validation of new or modified IT services. This stage consists of Transition Planning and Support (Project Management), change management, change evaluation, service asset and configuration management, release and deployment management, service validation and testing, knowledge management.
Service Operation – This stage ensures that services will be delivered at the agreed upon level. It is responsible for the support and care of services every day. This stage focuses on Event Management, Incident Management and Request Fulfillment.
Continual Service Improvement (CSI), – This stage is available for all stages. It focuses on the identification, management, and implementation of incremental improvements to services. This stage consists of the following: Service Review, Process Evaluation and Monitoring of CSI Initiatives.