ABP framework provides an **infrastructure** to make **Domain Driven Design** based development easier to implement. DDD is [defined in the Wikipedia](https://en.wikipedia.org/wiki/Domain-driven_design) as below:
> **Domain-driven design** (**DDD**) is an approach to software development for complex needs by connecting the implementation to an evolving model. The premise of domain-driven design is the following:
>
> - Placing the project's primary focus on the core domain and domain logic;
> - Basing complex designs on a model of the domain;
> - Initiating a creative collaboration between technical and domain experts to iteratively refine a conceptual model that addresses particular domain problems.
### Layers
ABP follows DDD principles and patterns to achieve a layered application model which consists of four fundamental layers:
- **Presentation Layer**: Provides an interface to the user. Uses the *Application Layer* to achieve user interactions.
- **Application Layer**: Mediates between the Presentation and Domain Layers. Orchestrates business objects to perform specific application tasks. Implements use cases as the application logic.
