---
id: intersections
title: Intersections
---
# Intersections
Intersections describe a type that must include all the intersection's constituents. Declare an intersection with the `&` operator.
```typespec
alias Dog = Animal & Pet;
```
An intersection is equivalent to [spreading](./models.md#spread) both types.
```typespec
alias Dog = {
...Animal;
...Pet;
};
```microsoft/typespec
Publicmirrored fromhttps://github.com/microsoft/typespecAvailable
docs/language-basics/intersections.md
21lines · modepreview