Services are intangible economic activities that are generally consumed as they are produced. They include activities like banking, education, transportation and more. Services are characterized by intangibility, inseparability, heterogeneity, and perishability. Due to these characteristics, services can be difficult to inventory, quality can be hard to measure, and demand fluctuations must be carefully managed. The service sector plays an important role in most modern economies and includes industries that facilitate the movement and sale of goods. Service marketing focuses on meeting customer needs through intangible promises.