The CRM(Customer relationship Management) is a unified information system which is used for programming, timing and controlling the previous activities. And after the sale of the organization it is applied with the aim of the making the customers able to interact with the organizations through numerous tools such as web, telephone and etc.

Principally CRM is referred to the soft wares which organize the relationship between the companies and the customers. For example these kinds of soft wares can create the data bases containing the data related to the customers and the type of the services which have been received by them in order to be accessible for the sale officials and even in some cases for some of the customers. This fact caused that the sale officials can satisfy their needs in an easier way through analyzing the data such as previous needs and problems of the customers.

The general concept which is can be deducted from the posed definitions in this field, indicates a kind of relationship between the customers and the providing organizations which provides important information about the real and potential customers to the organizations. The organization can be able to find new customers for their products (goods and services) through this system and among the previous customers the most beneficial of them are identified and supported for the survival of the organization.