Importing and updating contacts
by 
To automate the import and update of contacts from one application to another.
Emails, SMS and voice messages
by
To automate the sending of messages between Digitaleo and your application.
What you can do with 
Synchronise your contacts unilaterally
For example: create a contact in Magento when the contact completes a Digitaleo form.
Automate your text messages, emails and voicemails
For example: sending a form to a customer with Digitaleo when their order is "delivered" in Magento.