Enterprise architecture refers to an organization’s business architecture, IT architecture, and management thereof.
Business architecture refers to capabilities that enable the organization’s business model, and to the underlying processes, information and other resources that sustain the capabilities.
IT architecture refers to the equipment, platforms, applications, and data used to enable the processes.
All organizations have enterprise architecture, whether its intentionally designed for efficient execution of the envisioned business model or the random result of an endless series of uncontrolled changes over time.
Making controlled changes to your enterprise architecture requires that it is communicated, understood and accepted throughout the entire organization, which demands that it needs to be documented and made readily available to everyone in the organization.