Terminology relevant to the topics discussed up to this point, as described in the official ITIL glossary (v3.1.24, May 2007):
IT Service Management (ITSM)
The implementation and management of Quality IT Services that meet the needs of the business. IT Service Management is performed by IT Service Providers through an appropriate mix of people, process and information technology.
IT Infrastructure Library (ITIL)
A set of Best Practice guidance for IT Service Management. ITIL is owned by the OGC and consists of a series of publications giving guidance on the provision of Quality IT Services, and on the processes and facilities needed to support them.
IT Service
A service provided to one or more customers by an IT Service Provider. An IT Service is based on the use of information technology and supports the customer's business processes. An IT Service is made up from a combination of people, processes and technology and should be defined in a Service Level Agreement.
Best Practices
Proven activities or processes that have been successfully used by multiple organizations.
Source: Official ITIL Glossary (v3.1.24, May 2007)
