There are several enrolment rules you can choose from when creating a new workflow.
Trigger: New contact is created in your account.
Contact in list
Trigger: Contact belongs to a specific list.
Contact joined list
Trigger: Contact enters a list.
Contact in segment
Trigger: Contact exists in a specific segment.
Contact joined segment
Trigger: Contact enters a specific segment.
Contact exits list
Trigger: Contacts leaves a specific list.
Custom date field
Trigger your automation based on a selected value in a date field. Select how many days you want the automation to be triggered before or after a specified date.
Contact behaviour action
Trigger your automation workflow based on behaviour relating to an email campaign. Choose whether the automation is triggered by a click, open, or a send of a specific campaign.
Contact submitted survey
Trigger: Contact completes a specific survey.
Contact submitted via API feed
Enrol contacts into your workflow when data is passed via the API.