In this course, you are going to learn the most important concepts of Domain Driven Design or DDD for short. You will see both benefits and drawbacks, techniques to model, how DDD can be implemented using hexagonal architecture and many other amazing concepts.

By the end of this course, you will be able to take complex business requirements and processes and turn them into meaningful software.

Domain Driven Design Made Easy

Now, let us implement the port layer on top of the use case layer.


## Example definition
We will continue with the example defined in the [Domain Layer lesson](https://www.educative.io/pageeditor/10370001/4616975235416064/6471623718207488#Example-definition) and implement the port layer on top of the use case layer. It is important to mention that this layer will be in charge of exposing an interface, which will define the functionalities that a component offers and how we can invoke them.
 


### Model definition
The following diagram depicts the port layer, which defines four artifacts. Additionally, this layer makes use of the use case layer.


Now, let us implement the port layer on top of the use case layer.


# Example definition
We will continue with the example defined in the [Domain Layer lesson](https://www.educative.io/pageeditor/10370001/4616975235416064/6471623718207488#Example-definition) and implement the port layer on top of the use case layer. It is important to mention that this layer will be in charge of exposing an interface, which will define the functionalities that a component offers and how we can invoke them.
 


## Model definition
The following diagram depicts the port layer, which defines four artifacts. Additionally, this layer makes use of the use case layer.


Learn more about the ports layer, through the implementation of an example.

Introduction

Mapping Domain to Model

Domain Activities

Domain Objects

Domain Abstractions

Hexagonal Architecture

Conclusion

Port Layer

Example definition

Model definition