What would a schema look like if the architecture was monolithic?

In monolithic architecture, all components of the application are combined into a single unit, which is deployed and scaled as a whole.

Schematically, it can be represented as:

+-------------------------------------+
|             Monolithic              |
|             application             |
|                                     |
|  UI  +  Business logic  +  Data   |
+-------------------------------------+
          |               |
       Web server      Database

Here:

• All logic (interface, business rules, data access) resides in one application.
• There is no separation into separate services or modules that are deployed independently.
• Scaling occurs as a whole, not by individual parts.

This approach is simpler in the initial development stages but is less flexible and scalable compared to microservices architecture.