Hosting is a professional service which consists of the outsourcing of  part of its infrastructure and the associated services of management.
 The field of application of the services of external hosting is particularly vast and depends on the extent of the available resources:

Material platform 

• Provision of disk space on a server.
• Put at the disposal of network capacities and infrastructure of safety and of management of components of the software and of the
  
• services.
• Operating systems and environments.
• Data bases.
• Management of the messaging.
• Platform of management of streaming video of the information system. 
  

An increasing number of companies wish to take advantage of  the possibilities of savings bound to the development of information technologies, but do not arrange means or size necessary to be equipped with an adequate service and insure the functioning. An installation of this type requires an investment of consequent take-off, without speaking about tasks of management, recruitment, development and efforts required to keep the key employees in a strongly competitive environment. Somes companies which had initially dashed into delocalized center owners see  their own strategy because they have difficulty in making profitable  operation.