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

Continuing with the restaurant example used above, let us implement the use case layer on top of the domain layer.

## Example definition
Let's continue with the example defined in the [Domain Layer lesson](https://www.educative.io/pageeditor/10370001/4616975235416064/6471623718207488#Example-definition) and implement the use case layer. This layer will be in charge of the orchestration of domain objects to fulfill business needs.

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


Continuing with the restaurant example used above, let us implement the use case layer on top of the domain layer.

# Example definition
Let's continue with the example defined in the [Domain Layer lesson](https://www.educative.io/pageeditor/10370001/4616975235416064/6471623718207488#Example-definition) and implement the use case layer. This layer will be in charge of the orchestration of domain objects to fulfill business needs.

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


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

Introduction

Mapping Domain to Model

Domain Activities

Domain Objects

Domain Abstractions

Hexagonal Architecture

Conclusion

Use Case Layer

Example definition

Model definition