graph LR
subgraph Frontend
    UI
end
subgraph Backend
    API
end
subgraph Database
    DB
end
UI --> API
API --> DB
---
+--------+ +---------+ +--------+
|Frontend| | Backend | |Database|
|        | |         | |        |
|        | |         | |        |
| +----+ | | +-----+ | | +----+ |
| |    | | | |     | | | |    | |
| | UI |---->| API |---->| DB | |
| |    | | | |     | | | |    | |
| +----+ | | +-----+ | | +----+ |
|        | |         | |        |
+--------+ +---------+ +--------+
