The subject of this final professional work is service as an element of the marketing mix. The marketing mix is presently a very important strategy for gaining a competitive advantage. Managers use this strategy to be successful in business, and to achieve their planned goals. One of the elements of the marketing mix, which is part of our daily routine and is elaborated throughout the work is service. It is usually intangible, heterogeneous, and cannot be stored for some future time. The specificity of the service market is risk taking. Risk is present during the provision of services, because the provision of services varies depending on the provider. Therefore, great importance is given to the importance and quality of service delivery. Also, the risk is reflected in the inability to sell services or to see services before they are delivered. Today, the provision of services in the economy has reached the height of its existence. As a result, the number of employees in the service sector is steadily increasing. American Exspress is featured in this professional work. Today, this company is one of the leading financial industries. Amreican Exspress offers its customers a large selection of cards and checks and offers many benefits when using the products listed. In this professional work, through specific units, it will be show what the service really is, what its features are and why marketing is important to the company.