# Basic Scenarios

Liveness is checking that a person on a video is a real living person.

{% content-ref url="/pages/-MTZUjACUq06a6fPJAMb" %}
[Liveness](/oz-knowledge/guides/developer-guide/api/oz-api/basic-scenarios/liveness.md)
{% endcontent-ref %}

Biometry compares two or more faces from different media files and shows whether the faces belong to the same person or not.

{% content-ref url="/pages/-MTZX48cymRyhvE4R-k6" %}
[Biometry (Face Matching)](/oz-knowledge/guides/developer-guide/api/oz-api/basic-scenarios/biometry.md)
{% endcontent-ref %}

Best shot is an addition to the Liveness check. The system chooses the best frame from a video and saves it as a picture for later use.

{% content-ref url="/pages/-MTZXOEa5zs7gu5lPmrj" %}
[Best Shot](/oz-knowledge/guides/developer-guide/api/oz-api/basic-scenarios/liveness/best-shot.md)
{% endcontent-ref %}

Blacklist checks whether a face on a photo or a video matches with one of the faces in the pre-created database.

{% content-ref url="/pages/-MbH5WGw9\_eXoJrvuCvU" %}
[Collection (1:N) Check](/oz-knowledge/guides/developer-guide/api/oz-api/basic-scenarios/collection.md)
{% endcontent-ref %}


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://doc.ozforensics.com/oz-knowledge/guides/developer-guide/api/oz-api/basic-scenarios.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.