> ## Documentation Index
> Fetch the complete documentation index at: https://developers.apob.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Models and elements

> Distinguish character models, reusable reference elements, and generated media.

## Character models

A character model represents a reusable identity for supported generation
workflows. It helps you create new media featuring that character.

Creating a model and generating an image are separate operations. Model creation
has its own task and readiness state. Wait for the model to become ready before
using it in a generation that requires a trained model.

Some workflows can generate media without a character model. Follow the choices
offered by your integration rather than assuming every operation requires one.

<Note>
  A Portrait Master image is an image output. Creating one does not, by itself,
  create a trained character model.
</Note>

## Reference elements

An element is a reusable reference asset. Depending on the workflow, a reference
can provide visual content, motion, or audio context.

Personal elements belong to your account. Community elements are usable only
when their visibility and availability permit it. A known identifier is not
enough to access another account's private reference.

A workflow may support image, video, or audio elements with different limits.
These limits can depend on quality, duration, source footage, and voice selection.
Use the options exposed by the selected workflow; a reference accepted by one
workflow is not automatically valid in another.

## Generated media

Media is an individual image, video, or audio output. A single generation can
produce multiple media items. Keep the output you want to reuse and select it as
the source of a later operation where supported.

## Which resource do you need?

| Goal | Resource |
| - | - |
| Reuse a character's identity | A ready character model. |
| Provide a reusable visual or audio reference | An available element supported by the workflow. |
| Edit or continue an existing result | The selected source media. |
| Follow work that is still running | The task identifier, not a model or media identifier. |

Learn how these resources relate to [tasks and results](/concepts/tasks-and-results),
then [prepare your input media](/guides/preparing-media).


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