> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://amplified.crisp.help/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# Contacts and types of subscribers

Your contacts list is the backbone of your marketing strategy. From building a database of existing customers to delivering tailored content based on specific interactions, it will help grow your business in powerful ways.

Use this page to see who is receiving information from you, find out if someone unsubscribed, or the date that a contact was created.

There are three types of subscribers:

*   **Subscribed**
    
    Customers allowing to receive marketing notifications from you. They can subscribe to email, phone, or both types of channels.
    
*   **Non-subscribed**
    
    Customers that neither explicitly unsubscribed nor explicitly subscribed. We may have obtained their email because they placed an order, but didn't choose to receive marketing content.
    

*   **Unsubscribed**
    
    Customers that explicitly opted out from your contacts list after receiving marketing content.