# Lists

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

Unlike [segments](/applications/audience/lists-and-segments/concepts/segments.md), 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](/applications/sign-up-forms/overview.md),  you need to specify if the list requires [single](/applications/audience/contacts/concepts/consent-and-subscriptions/opt-ins-consent-and-subscription-statuses.md#single-consent) or [double](/applications/audience/contacts/concepts/consent-and-subscriptions/opt-ins-consent-and-subscription-statuses.md#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="/files/hwZbbFgM3k1Vgy7jy9Bj" alt=""><figcaption></figcaption></figure></div>

{% hint style="info" %}
See also:

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


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