What is the difference between traditional enterprise it architecture and private cloud?

The IT architecture of an enterprise refers to the architecture of a set of information systems that support the business operation of the enterprise. A complete IT architecture should include: various business application systems, such as PDM, SCM, CRM, etc. Management application systems, such as OA, ERP, HR, etc. Support and run middleware software, database software, operating system, etc. of the above application systems.