# Lists

Lists are static collections of contacts that are grouped together based on specific criteria. 

Unlike [segments](https://docs.bird.com/applications/audience/lists-and-segments/concepts/segments), contacts are not automatically added or removed from lists based on changes to their profile information. Instead, contacts must be manually added or removed from groups.

Lists are a useful way to organize contacts based on specific characteristics or attributes. For example, you may want to create a group for VIP customers or a group for customers who have opted-in to receive promotional offers.

### Set up single or double consent on a list

When setting up a list to be used with a [sign-up form](https://docs.bird.com/applications/sign-up-forms/overview),  you need to specify if the list requires [single](https://docs.bird.com/applications/contacts/concepts/consent-and-subscriptions/opt-ins-consent-and-subscription-statuses#single-consent) or [double](https://docs.bird.com/applications/contacts/concepts/consent-and-subscriptions/opt-ins-consent-and-subscription-statuses#double-consent) consent.

You can do this by choosing the consent type you want to use from the dropdown.

<div align="left"><figure><img src="https://3861485111-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FU9kiDiTGVD8kkbnKKyEn%2Fuploads%2FctPIJoKGppmtHFKiceNA%2Flist3.png?alt=media&#x26;token=9b4f9d35-b757-44b8-8dd6-914f00aff88e" alt=""><figcaption></figcaption></figure></div>

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See also:

* [Opt-ins, consent, and subscription statuses](https://docs.bird.com/applications/audience/contacts/concepts/consent-and-subscriptions/opt-ins-consent-and-subscription-statuses)
  {% endhint %}