According to Jamier L. Scott. (2002),^[1] “Customer service is a series of activities designed to enhance the level of customer satisfaction – that is, the feeling that a product or service has met the customer expectation."

Its importance varies by product, industry and customer; defective or broken merchandise can be exchanged, often only with a receipt and within a specified time frame. Retail stores will often have a desk or counter devoted to dealing with returns, exchanges and complaints, or will perform related functions at the point of sale.

Customer service may be provided by a person (e.g., sales and service representative), or by automated means called self-service. Examples of self service are Internet sites. However, in the Internet era, a challenge has been to maintain and/or enhance the personal experience while making use of the efficiencies of online commerce. Writing in Fast Company, entrepreneur and customer systems innovator Micah Solomon has made the point that "Online customers are literally invisible to you (and you to them), so it's easy to shortchange them emotionally. But this lack of visual and tactile presence makes it even more crucial to create a sense of personal, human-to-human connection in the online arena."^[2]

Customer service is normally an integral part of a company’s customer value proposition. In their book Rules to Break and Laws to Follow, Don Peppers and Martha Rogers, Ph.D. write that "customers have memories. They will remember you, whether you remember them or not." Further, "customer trust can be destroyed at once by a major service problem, or it can be undermined one day at a time, with a thousand small demonstrations of incompetence."^[3]

From the point of view of an overall sales process engineering effort, customer service plays an important role in an organization's ability to generate income and revenue.^[4] From that perspective, customer service should be included as part of an overall approach to systematic improvement. A customer service experience can change the entire perception a customer has of the organization.

Some have argued^[5] that the quality and level of customer service has decreased in recent years, and that this can be attributed to a lack of support or understanding at the executive and middle management levels of a corporation and/or a customer service policy. To address this argument, many organizations have employed a variety of methods to improve their customer satisfaction levels, and other KPIs.