What is Client? What is the difference between Customization and Configuration?

The difference between cutomizing and configuration is:
- CONFIGURATION: we will configure the system to meet the needs of your business by using the existing data.
- CUSTOMIZING: we will customise or adapt the system to your business requirements, which is the process of mapping SAP to your business process.
- CLIENT: A client is a unique one in organizational structure, can have one or more company codes. Each company code is its own legal entity in finance.

Configuration vs. Customization
When considering enterprise software of any type, it is important to understand the difference between configuration and customization.The crux of the difference is complexity. Configuration uses the inherent flexibility of the enterprise software to add fields, change field names,modify drop-down lists, or add ****ons. Configurations are made using powerful built-in tool sets. Customization involves code changes to create functionality that is not available through configuration. Customization can be costly and can complicate future upgrades to the software because the code changes may not easily migrate to the new version.Wherever possible, governments should avoid customization by using configuration to meet their goals.Governments also should understand their vendor's particular terminology with regard to this issue since words like "modifications" or "extensions" often mean different things to different vendors.

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We know that SAP R/3 is software, it particular it is client-server software. This means that the groups/layers
that make up a R/3 System are designed to run simultaneously across several separate computer systems.
When you install Microsoft Excel on your PC, each component of Excel (printing components, graphing components, word processing components, and etc.) is stored, managed, and processed via the hardware of your PC. When a company installs SAP’s software each component (or "layer” in R/3’s case) is stored, managed, and processed via the hardware of separate and specialized computer systems. Each of the various layers is capable of calling upon the specialty of any of the other installed layers in order to complete a given task.

Those components/layers that are requesting services are called “clients”, those components/layers that are providing services are called “servers”. Thus the term - “client/server”.

SAP is an ERP (Enterprise Resource Planning) module, ECC is the version of SAP, like 4.6, 4.6c and 4.7 in that series new version is ECC-6. Its known as Enterprise core component.