> For the complete documentation index, see [llms.txt](https://docs.rainbird.ai/rainbird/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.rainbird.ai/rainbird/knowledge-modelling/modelling-features/concepts/concept-instances.md).

# Concept instances

## Overview <a href="#rrbd42w32rgu" id="rrbd42w32rgu"></a>

For any given concept a concept instance is its data. You can think of concept instances as examples of the concept. i.e. given a concept of `Country`, the instances could be `France` or `Germany`.

Only concepts with a `string` data type allow you to create your own instances.

Concepts with a data type of `number`, `date` or `true/false` do not require instances to be explicitly created.

Opening a concept with a string data type will display an instances section and you can add instances like this:

<figure><img src="/files/hGyGBUy4dTkthhcSCjaO" alt=""><figcaption></figcaption></figure>

## **Metadata**

Additional information about a concept instance can be added as metadata, if it is necessary to provide further context about it e.g. providing an explanation of a particular tax code.

This data can be presented to end-users, if required, when the instance is referenced in a question or a result from Rainbird.

The image below shows an example of Metadata added to a concept instance. This input can be expanded for large metadata:

![](/files/alR3fUmFKgtqa4OKqCpZ)

The below image shows an example of how the Metadata could be presented with a result:

![](/files/QKUseAMslWSBI7Lmtl3r)

This data can also be formatted using markdown. More details can be found on supported markdown [here](/rainbird/knowledge-modelling/modelling-features/other-features/markdown.md).


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