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ITIL
The Information Technology Infrastructure Library (ITIL) is an Information Technology (IT) management framework that provides practices for Information Technology Services Management (ITSM), IT development and IT operations.
ITIL gives detailed descriptions of a number of important IT practices and provides comprehensive checklists, tasks and procedures that any IT organization can tailor to its needs. ITIL is published in a series of books, each of which covers an IT management topic. The names ITIL and IT Infrastructure Library are registered trademarks of the United Kingdom's Office of Government Commerce (OGC).

HISTORY
Responding to growing dependence on IT, the UK Government's Central Computer and Telecommunications Agency in the 1980s developed a set of recommendations. It recognised that without standard practices, government agencies and private sector contracts were independently creating their own IT management practices.

The IT Infrastructure Library originated as a collection of books, each covering a specific practice within IT Service Management. ITIL was built around a process-model based view of controlling and managing operations often credited to W. Edwards Deming and his plan-do-check-act (PDCA) cycle.

After the initial publication in 1989–1996, the number of books quickly grew within ITIL v1 to over 30 volumes.
In 2000/2001, to make ITIL more accessible (and affordable), ITIL v2 consolidated the publications into 8 logical "sets" that grouped related process-guidelines to match different aspects of IT management, applications, and services.

However, the main focus was known as the Service Management sets (Service Support and Service Delivery) which were by far the most widely used, circulated, and understood of ITIL v2 publications.
In April 2001 the CCTA was merged into the Office of Government Commerce (OGC), an office of the UK Treasury.

In 2006, the ITIL v2 glossary was published.

In May 2007, this organisation issued the version 3 of ITIL (also known as the ITIL Refresh Project) consisting of 26 processes and functions, now grouped under only 5 volumes, arranged around the concept of Service lifecycle structure.
In 2009, the OGC officially announced that ITIL v2 certification would be withdrawn and launched a major consultation as per how to proceed.

OVERVIEW/: ITIL v3 LIBRARY
ITIL v3 is an extension of ITIL v2 and will fully replace it following the completion of the withdrawal period on 30 June 2011. ITIL v3 provides a more holistic perspective on the full life cycle of services, covering the entire IT organisation and all supporting components needed to deliver services to the customer, whereas v2 focused on specific activities directly related to service delivery and support. Most of the v2 activities remained untouched in v3, but some significant changes in terminology were introduced in order to facilitate the expansion.

Five volumes comprise the ITIL v3, published in May 2007:
1. ITIL Service Strategy
2. ITIL Service Design
3. ITIL Service Transition
4. ITIL Service Operation
5. ITIL Continual Service Improvement

CERTIFICATION
The certification scheme differs between ITIL v2 and ITIL v3 and bridge examinations let v2 certification owners transfer to the new program. ITIL v2 offers 3 certification levels: Foundation, Practitioner and Manager. These should be progressively discontinued in favour of the new ITIL v3 scheme. ITIL v3 certification levels are: Foundation, Intermediate, Expert and Master.

Ref: Wikipedia