# Technical references

> Each Amazon Textract activity calls a [Amazon Textract API](https://docs.aws.amazon.com/textract/latest/dg/API_Reference.html) using the request parameters you enter in the activity's input properties. If the call is successful, the activity outputs the relevant response elements (that is, output properties) that you can use as input property values in subsequent activities, queue items in an existing Queue, and so on.

Each Amazon Textract activity calls a [Amazon Textract API](https://docs.aws.amazon.com/textract/latest/dg/API_Reference.html) using the request parameters you enter in the activity's input properties. If the call is successful, the activity outputs the relevant response elements (that is, output properties) that you can use as input property values in subsequent activities, queue items in an existing Queue, and so on.

For a complete list of the Amazon Textract APIs used by each activity and links to the relevant API documentation, see the [Technical References](https://docs.uipath.com/activities/other/latest/legacy-integrations/amazon-textract-technical-references#technical-references) page. You don't need to be familiar with the Amazon Textract APIs to use the activities. **These links** are for **informational purposes only** in case you want to learn more about the action happening "behind-the-scenes".