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The difference between a customer and a client can be rather confusing, and even controversial. The most commonly accepted and basic description of the difference is that a customer purchases goods or services from a business whereas a client receives services from a professional such as a lawyer or accountant.
What is Client in SAP. A client is organizational and legal entity in the SAP system. All the business management data is protected here because other clients can not access them.The main objective of the client is to keep the data isolated.The data in a client can be only visible within that client; it can not be displayed or changed from another client. In a physical SAP system there can be multiple clients.lient 000 in SAP R/3 comes with a simple organizational structure. It is a sort of test company. Client 000 contains all standard configurations, parameters, standard transactions, etc that are normally used in the SAP R/3 business environment.