DDD: Domain Driven Design

What is a repository?

A repository is a persistence abstraction layer that sits between your business logic and your data layer.

What is an aggregate?

An aggregate is a object that contains related entities and value objects. Basically it's a composite object that contains related objects.

Where are your Repo's best placed in your App architecture?

Database -> ORM -> Repository -> Business Logic

What is an aggregate root?

It is the main object. If you are building a CSV builder system the CSV may be your aggregate root. It is comprised of value objects like write / read objects and other stuff.

How should a repository behave?

It should act as a simple in-memory store yet delegate it's persistence to the appropriate layer behind the scenes.

What is a bounded context?

The scope of responsibility and reference in which an object exists. Think of it as a namespace. You may have a Models/Customer and also a Helpers/Customer. Both have specific bounded contexts.