# Field Mappings

## Field Mapping

Field mappings define how data from an external Data Source is read into the Aisera platform and, optionally, written back. They are configured per Data Source and can be found at the bottom of the **Data Source Details** page under **Settings > Data Sources**.

<figure><img src="https://3281977978-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FvBFXjH9S1CAy9f5hzg5Q%2Fuploads%2F6SLGCCTMYLR7gQnJhfvc%2Ffield_mapping4.png?alt=media&#x26;token=8466b2a5-12e7-4db4-9fdb-63ffc874233f" alt=""><figcaption><p>Data Source Field Options</p></figcaption></figure>

Aisera provides two types of fields you can map:

**Standard Fields** are predefined Aisera fields. Out of the Box (OOTB) Data Sources come with standard fields pre-mapped to the Aisera Platform. You can add or modify these mappings as needed. See [New Field Mapping](https://docs.aisera.com/aisera-platform/adding-data-to-your-tenant/data-ingestion/field-mappings/creating-a-new-field-mapping) to connect a standard field to your Data Source.

**Custom Fields** are fields that you define for data that has no standard equivalent on the Aisera Platform. This could include data such as organization specific metadata, tags, or custom fields from your external systems. See [New Custom Field](https://docs.aisera.com/aisera-platform/adding-data-to-your-tenant/data-ingestion/field-mappings/creating-a-custom-field) to map this data to the Aisera Platform.

Once configured, field mappings can be exported as backups or to replicate a configuration across multiple Data Sources. See [Export Fields Mappings](https://docs.aisera.com/aisera-platform/adding-data-to-your-tenant/data-ingestion/field-mappings/exporting-field-mappings) and [Import Field Mappings](https://docs.aisera.com/aisera-platform/adding-data-to-your-tenant/data-ingestion/field-mappings/importing-field-mappings).