ITIL is the IT Infrastructure Library, as published by the OGC

This is the Office of Government and Commerce, part of the UK government, and formerly known as the CCTA.

Yes, very much so.

According to the OGC, it is intended for IT service providers, IT directors and managers, and CIOs.

Yes. The certificates issued by both ISEB or EXIN are recognized everywhere.

The lengthy process of updating ITIL is now complete. The process was known as the ITIL Refresh. The new version is ITIL v3 (or ITIL Version 3).