A Deliverable is discrete component of work, such as a single illustration, news article, or 3D model. A Deliverable can also be a service, such as catering at an event, or software development performed for a specified period of time. Each Deliverable is tied to a Release, and each Release can have any number of Deliverables.
A Job uses a contract to connect a single contractor to any number of Deliverables that they have agreed to deliver.