> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ltv.ai/llms.txt
> Use this file to discover all available pages before exploring further.
# Lists
> Build, import, and manage saved audiences
A list is a saved audience you can reuse across campaigns.
Find them under **Manage Modules > Lists**.
## Where lists come from
| Source | Notes |
| ------------------- | ------------------------------------------------------------------------ |
| CSV upload | Columns are detected automatically. Uploads up to 150 MB. |
| Klaviyo segments | Synced live with contact counts. See [Klaviyo](/connect/klaviyo). |
| Mailchimp audiences | Synced from your connected account. See [Mailchimp](/connect/mailchimp). |
| Built in LTV.ai | Describe the audience you want in plain language. |
## Build a segment with AI
Choose **Build Segment with AI** and describe the audience you want. LTV.ai turns the description into a query against your customer data, shows you the count, and saves it as a list.
Things you can ask for:
* Customers who bought twice or more but not in the last 90 days
* Everyone in California who has spent over 200 dollars
* People who opened the last three campaigns but never clicked
You can segment on purchase behavior, engagement history, location, sign up date, and customer tags synced from Shopify.
A saved list is a snapshot of the query result at the time you saved it, not a live rule. Rebuild it before a campaign if the underlying data has moved.
## Using a list
Lists can be used as a campaign audience or as an exclusion list. Any list can be either. See [Exclusions and suppression](/audience/exclusions).
## Uploading a CSV
Upload from the Lists page. LTV.ai reads the header row and maps the columns.
Every upload is checked against your unsubscribe and bounce records before sending. An imported CSV cannot reintroduce someone who has already opted out.