Salesforce Sales Cloud can be used as:
When working with lead flows, you can create new Leads or Contacts in your Salesforce account and optionally add them as members of a campaign of your choice. When working with audience flows, you can pull Leads or Contacts in your Salesforce account that are members of a given campaign.
Connecting your Salesforce Sales Cloud account with Ads Workbench is really simple. You just need to follow these steps:
A lead flow is an automation that allows you to collect the leads coming from a source and send them to multiple destinations. Once your ad account is connected and your have created the integrations for the systems where the leads will be sent, you can create you lead flow as described in the following video:
An audience flow is an automation that allows you to keep fresh your custom audiences using as an input your subscribers' or contacts' data. Once your ad account is connected and your have created the integrations for the systems where your contacts' data is stored you can create you audience flow as described in the following video: