What is the difference between business logic models and data models in an application?

A data model describes the structure and format of data storage in an application — for example, how database tables are organized or how objects containing data are structured. It is responsible for data representation and storage.

A business logic model describes the rules and processes that define the application's behavior — how data is processed, what operations are performed, what conditions are checked.

Example: in an online store, the data model might include product details (name, price, quantity), while the business logic model includes rules for calculating discounts, checking stock availability, and order processing.