Customer satisfaction (CS) has attracted serious research attention in the recent past year. Customer satisfaction is now for all companies the primary criterion for the assessment of their relationship with the market, a permanent object of their operating policies and an important element for the reinforcement of company reputation, as well as a fundamental guide to direct operational processes. So this paper is done in order to have a deeper understanding on the customers? satisfaction but especially help the students, the managers and also all person which can use it. We will going to see some definitions of the customer satisfaction, factors affecting customer satisfaction, and also measuring the customer satisfaction.