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# Imports in Fern Definition

> Use imports to reference API types and errors from other Fern Definition files.

Fern Definition isn't recommended for new customers and Fern isn't accepting feature requests for this format. It remains supported for existing users.

Imports allow you to reference types and errors from other files.

**`person.yml`**

```yaml title="person.yml"
types:
  Person: ...
```

**`family.yml`**

```yaml title="family.yml"
imports:
  person: ./path/to/person.yml
types:
  Family:
    properties:
      people: list<person.Person> # use an imported type
```

Note that you can only import files that exist in your Fern Definition (i.e., in the same `definition/` folder).

> Use imports to reference API types and errors from other Fern Definition files.