It means to inspire trust and confidence. Assurance is defined as employees' knowledge of courtesy and the ability of the firm and its employees to inspire trust and confidence. This dimension is likely to be particularly important for the services that the customers perceives as involving high rising and/or about which they feel uncertain about the ability to evaluate. Trust and confidence may be embodied in the person who links the customer to the company, for example, the marketing department. Thus, employees are aware of the importance to create trust and confidence from the customers to gain competitive advantage and for customers' loyalty.