Support Service - Support Service is a component of ITIL, which covers the following support and maintenance processes:

• Service Desk (function); 
• Incident Management (process); 
• Problem Management (process); 
• Change Management (process); 
• Release Management (process); 
• Configuration Management (process).

The Service Desk provides a single point of contact (SPOC, Single Point Of Contact) central to all users of IT services within an organization, which manages all incidents, requests and demands for action or change.
It also provides an interface for all other Service Support processes.
The Incident Management is responsible for handling all incidents, their detection and registration until the resolution and closure. The objective of the Incident Management is to restore normal service as soon as possible, with minimal impact on business.
Problem Management has the main objective to minimize the adverse impact of incidents and problems on business. To achieve this, the Problem Management works with the process of Incident Management by managing all incidents and problems more important, recording all the workaround and quick fixes  as well as the Known Errors (Known Errors), where appropriate and promote change (Changes) to implement permanent structural solutions wherever possible. The Problem Management also analyzes and forecasts incidents and problems to proactively prevent the occurrence of further incidents and problems.
Change Management as a single centralized process is vital for effective and efficient change management. The changes must be carefully managed throughout their lifecycle, from registration, filtering, assessment, classification, authorization, planning, implementation, testing, implementation and review and closure. One of the fundamental output of the process is the Forward Schedule of Change (FSC) - a centralized plan of the changes agreed with all areas, based on business impact and the urgency of change implementation.
The Release Management provides an overview of changes to IT services, considering all aspects of a Release, either technical or not. The Release Management is responsible for all legal and contractual commitments, either hardware and software in use within the organization. To achieve this, and protect IT assets, the Release Management creates safe environments for hardware such as the Storage of reference - Definitive Hardware Store (DHS) - and for software such as Reference Library Software - Definitive Software Library (DSL).
The Configuration Management provides the basis for good management of information technology services and any other process. The key component is the Configuration Management Database (CMDB), which includes one or more integrated databases detailing all of the components of your IT organization and other important associated assets. These are assets that provide IT services and are known as Configuration Items (CI). What distinguishes a CMDB from an archive of classic asset is the relationships, or connections, which define how each element (CI) is interconnected and interdependent with its neighbours. These reports allow you to undertake activities such as impact analysis and 'what if ?' scenario The CMDB also contains details of each incident, problem, known error and change associated with each CI.