> ## 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.

# Classification-Related Objects

This section contains descriptions of the following classification-related objects:

* [ClassificationEngine](/fine-reader/engine/api-reference/classification-related-objects/classificationengine)
* [Trainer](/fine-reader/engine/api-reference/classification-related-objects/trainer)
* [Model](/fine-reader/engine/api-reference/classification-related-objects/model)
* [ClassificationResults](/fine-reader/engine/api-reference/classification-related-objects/classificationresults)
* [ClassificationResult](/fine-reader/engine/api-reference/classification-related-objects/classificationresult)
* [TrainingResults](/fine-reader/engine/api-reference/classification-related-objects/trainingresults)
* [TrainingResult](/fine-reader/engine/api-reference/classification-related-objects/trainingresult)
* [ValidationResult](/fine-reader/engine/api-reference/classification-related-objects/validationresult)
* [ConfusionMatrix](/fine-reader/engine/api-reference/classification-related-objects/confusionmatrix)
* [TrainingParams](/fine-reader/engine/api-reference/classification-related-objects/trainingparams)
* [ValidationParams](/fine-reader/engine/api-reference/classification-related-objects/validationparams)
* [TrainingData](/fine-reader/engine/api-reference/classification-related-objects/trainingdata)
* [Categories](/fine-reader/engine/api-reference/classification-related-objects/categories)
* [Category](/fine-reader/engine/api-reference/classification-related-objects/category)
* [ClassificationObjects](/fine-reader/engine/api-reference/classification-related-objects/classificationobjects)
* [ClassificationObject](/fine-reader/engine/api-reference/classification-related-objects/classificationobject)

A typical procedure of training a classification model and using it to separate documents into categories is described in [Document Classification](/fine-reader/engine/guided-tour/basic-usage-scenarios-implementation/document-classification).

## The classification-related objects hierarchy

<img src="https://mintcdn.com/abbyy/6udH-pkk8zkVafYH/images/fine-reader/engine/classificationrelatedobjects.gif?s=77c874c96e400a91da6944d93c31c6a6" alt="ClassificationRelatedObjects" width="393" height="248" data-path="images/fine-reader/engine/classificationrelatedobjects.gif" />[](/fine-reader/engine/api-reference/classification-related-objects/classificationresult)[](/fine-reader/engine/api-reference/classification-related-objects/confusionmatrix)[](/fine-reader/engine/api-reference/classification-related-objects/classificationresults)[](/fine-reader/engine/api-reference/supplementary-objects-and-methods/stringscollection)[](/fine-reader/engine/api-reference/supplementary-objects-and-methods/stringscollection)[](/fine-reader/engine/api-reference/classification-related-objects/validationresult)[](/fine-reader/engine/api-reference/classification-related-objects/classificationobject)[](/fine-reader/engine/api-reference/classification-related-objects/classificationobjects)[](/fine-reader/engine/api-reference/classification-related-objects/model)[](/fine-reader/engine/api-reference/classification-related-objects/category)[](/fine-reader/engine/api-reference/classification-related-objects/categories)[](/fine-reader/engine/api-reference/classification-related-objects/trainingresult)[](/fine-reader/engine/api-reference/classification-related-objects/trainingresults)[](/fine-reader/engine/api-reference/classification-related-objects/validationparams)[](/fine-reader/engine/api-reference/classification-related-objects/trainingparams)[](/fine-reader/engine/api-reference/classification-related-objects/trainingdata)[](/fine-reader/engine/api-reference/classification-related-objects/trainer)[](/fine-reader/engine/api-reference/classification-related-objects/classificationengine)

For more information about the hierarchy of the ABBYY FineReader Engine objects, please see the [Object Diagram](/fine-reader/engine/api-reference/object-diagram).