# Inspection and Introspection

While we previously used [fields\_get()](https://www.odoo.com/documentation/16.0/developer/reference/backend/orm.html#odoo.models.Model.fields_get) to query a model and have been using an arbitrary model from the start, Odoo stores most model metadata inside a few meta-models which allows both querying the system and altering models and fields (with some limitations) on the fly over REST API.

<mark style="background-color:blue;">**Note**</mark>

1. [<mark style="background-color:blue;">Provides information about Odoo models via its various fields</mark>](/rest-api/inspection-and-introspection/ir.model.md) <mark style="background-color:blue;">(ir.model)</mark>
2. [<mark style="background-color:blue;">Provides information about the fields of Odoo models and allows adding custom fields without using Python code</mark>](/rest-api/inspection-and-introspection/ir.model.fields.md) <mark style="background-color:blue;">(ir.model.fields)</mark>


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