> For the complete documentation index, see [llms.txt](https://unity.zoeimmersive.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://unity.zoeimmersive.com/adding-interactivity/interactions/conditions/collision.md).

# Collision

**Collision** is when at least 2 objects collide.

* **Collision Mode:** if you select `ENTER`, it means objects have to be **in collision** with each other to validate the condition. If you select `EXIT`, it means objects need to **stop colliding** for the condition to be valid.
* **Target Object(s):** select at least 2 objects that need to be colliding (or not). If several objects are set it means whenever two of them collide (or stop colliding) the condition will validate.
* **Minimum duration required:** check details [here](/adding-interactivity/interactions/conditions/duration-parameter.md).

{% hint style="info" %}
*Note that the condition uses the **Proximity colliders** of the given IOs.*
{% endhint %}