An enterprise architecture is usually broken down into four architecture views as shown in the figure:
The business architecture view is used to define business goals, strategies, and KPIs and to describe organizations and business processes.
The application architecture describes the services and application systems that support the business processes, including the technologies used.
In the information architecture view, the business objects and data that are processed and exchanged by process participants and IT systems are described.
The infrastructure architecture (technical architecture) forms the lowest level. It is used to describe the physical landscape, the hardware, and the networks that are used for operation of the application systems.
Enterprise Architecture Management is the process-oriented description, analysis, and development of corporate IT using the views specified above.