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

# Extract activity

> Extract data from documents using Document skills, and map each class from a preceding Classify activity to the appropriate Document skill.

Use the **Extract** activity to extract data from documents using a Document skill.

To extract from multiple document types in one workflow, place a [Classify activity](/vantage/documentation/skill-designer/process/classify-activity) before the Extract activity and map each class to a Document skill in the **Actions** pane.

## Set up Document skills

Specify the Document skills that extract document fields:

<Steps>
  <Step title="Add skills">
    In the **Actions** pane, click **Add Skill** and select the skills you need from the **Skill Catalog**.
  </Step>

  <Step title="(Optional) Create a new Document skill">
    If you can't find a suitable skill in the **Skill Catalog**, click **Create New Skill** at the bottom of the **Actions** pane. In the form that appears, enter a name, a short description, and a list of required skills, then click **Done**. Train the new skill and publish it to the **Skill Catalog**.
  </Step>
</Steps>

<Note>
  Only published skills appear in the list of available Document skills.
</Note>

<Tip>
  To view demo documents for a skill, click the icon to the left of the skill's name. If the skill has no demo documents, an error message appears — this does not affect your setup.
</Tip>

## Map Document skills to classes

Map each Document skill to the matching class from the preceding Classification skill. Use one of two methods:

* **Per-skill mapping** — In the **Actions** pane, click the properties icon next to the Document skill name. In the dialog, select the class that corresponds to the document type the skill processes, and then click **Save**.
* **Bulk mapping** — Click **Edit Mapping** at the bottom of the **Actions** pane. In the dialog, connect each class to a skill from your list, and then click **Save**.

## Online learning

If the Process skill includes a verification stage, enable **Online learning** for Document skills from the Preview window. Online learning uses verification results to continuously improve each skill's precision. See [Online learning](/vantage/documentation/runtime/online-learning/online-learning) for details.

## Skill parameters

The Extract activity inherits skill parameters from the Document skill it uses. View or modify these values by clicking the skill-settings icon next to the Document skill name. See [Skill parameters](/vantage/documentation/skill-designer/skill-parameters/skill-parameters) for details.

## Related topics

* [Classify activity](/vantage/documentation/skill-designer/process/classify-activity)
* [Document skill](/vantage/documentation/skill-designer/document/document-skill)
* [Set up a Process skill](/vantage/documentation/skill-designer/process/set-up)
* [Skill parameters](/vantage/documentation/skill-designer/skill-parameters/skill-parameters)
* [Online Learning](/vantage/documentation/runtime/online-learning/online-learning)
* [Publish a skill](/vantage/documentation/skill-catalog/publish-skill)