This work focuses on a very demanding customer management, specifically marketing in the form of Customer Relationship Management (CRM). It is an economic study with a strong interdisciplinary character. It combines its business management focus with references to computer technology and law. The work is preceded by a brief introduction and a historical overview. Today's information technologies enable a company to enhance its relationships with customers in terms of value and duration. Radio-Frequency Identification (RFID) paves the way for the future Internet of Things, as companies integrate tiny computer chips (RFID tags or smart labels) into products and store equipment for the purpose of automatic radio detection.