This horizontal architecture diagram template is designed to help technical teams visualize the logical separation of concerns within a software system or application. The primary target users are software architects, developers, and product teams who need to communicate system structure to stakeholders with clarity. Users begin by identifying the specific components of the presentation layer to represent the user interface and client-side interactions. Next, they define the core business logic and processing rules within the middle application layer to show how data is handled. Finally, they map out the data storage and database management systems in the foundation layer to complete the technical stack. By following this process, teams achieve a comprehensive and easy-to-understand visual representation of their system's infrastructure and internal data flow.