> For the complete documentation index, see [llms.txt](https://siliconlang.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://siliconlang.org/documents/interfaces.md).

# Interfaces

```
interface Name {
    first: string;
    last: string;
}

interface Person {
    name: Name;
    age: i32;
}

interface WithLicense {
    licensed: bool;
}

interface Doctor extends Person, WithLicense {
    field: string;
}
```