> In SAP S/4HANA discussions, I find two discussions of client. One uses terms like dev or prod. Another uses numbers like 100. What is the difference? You're right, the term "client" in SAP S/4HANA can be confusing because it's used in two distinct contexts: 1. Logical Clients (Numbers like 100, 200, etc.): Definition: These are numerical clients within an SAP system. They represent separate, independent business entities or organizational units within the same physical SAP system. Purpose: Data Separation: Each client has its own master data, transactional data, and customizing settings. This means data in client 100 is completely separate from data in client 200. Organizational Isolation: It allows different departments, subsidiaries, or even entirely separate companies to use the same SAP system without interfering with each other's data. Testing and Development: Clients are often used for different purposes, such as: Development (DEV): Clie...