The Definition of Customer Service

Probably read about the definition of customer is considered as something very basic for the vast majority of marketers and entrepreneurs. However, if we consider that the client is "one" by whom plan, implement and control all activities of companies or organizations, we reach the conclusion that it does not hurt to review its definition from time to time not to forget "Who really is the client."
Definition of Customer, for marketing purposes:

According to the American Marketing Association (AMA), the client is "actual or potential buyer of the goods or services"
According to The Chartered Institute of Marketing (CIM, UK), the client is "a person or company who purchases goods or services (not necessarily the final consumer)".

In the Dictionary of Marketing, Cultural SA, found that "customer" is "a term that defines the person or organization that makes a purchase. May be buying on their behalf and personally enjoy the property acquired or purchased for other as the case of children's items. It is part of the largest population of the company.

In the book "Marketing Customers Who has been my client?" the following is mentioned: "The word comes from ancient Greek client and refers to the" person dependent ". That is, my clients are people who have some need for a product or service that my company can satisfy".

At this point, taking into account and extending the above, I propose the following definition of Customer:
Customer is the person, company or organization that acquires or voluntarily purchase products or services you need or want for yourself to another person or a company or organization, therefore, is the main reason they are created produce, manufacture and market products and services.

Some considerations Philip Kotler about customers:
 If you pay attention to their customers, some other company will make.
Companies should consider their customers as an asset that must be managed like any other asset of the company.
The products come and go. The challenge for companies focused on their customers that their products last longer. They have to consider the concepts more market life cycle and life cycle of the client instead of the concept of product life cycle.