The TOGAF standard divides Enterprise Architecture into four primary architecture domains: business, data, application, and technology. These domains represent different aspects of an enterprise and how they relate to each other. The business domain defines the business strategy, governance, organization, and key business processes. The data domain describes the structure of the logical and physical data assets and data management resources. The application domain provides a blueprint for the individual applications to be deployed, their interactions, and their relationships to the core business processes. The technology domain describes the logical software and hardware capabilities that are required to support the deployment of business, data, and application services. Other domains, such as motivation, security, or governance, may span across these four primary domains. Reference:
The TOGAF Standard, Version 9.2 - Core Concepts
Domains - The Open Group
TOGAF Standard - Introduction - Definitions - The Open Group
The TOGAF Standard, Version 9.2 - Definitions - The Open Group
TOGAF and the history of enterprise architecture | Enable Architect