What focuses on using information about customers to create marketing strategies that develop and sustain desirable customer relationships?

Customer Relationship Management

Explanation:

Customer relationship management( CRM) aims at improving upon customer relationships via means of providing quality products and focusing upon better after sales services.

Such an activity helps build business relationships. The focus of CRM activities is upon providing better customer services.

CRM utilizes historical and current customer information upon which marketing strategies are formed and based so as to provide them with highest quality services which enable a business build lasting relations with it's customers.

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