Has a membership allows you to segment based on your active members, or those who do not have memberships!
*Note: The "Does not have a membership" condition only omits those contacts who had that specific membership the past but do not currently have it.
You can also drill down to membership status, which allows you to target those who are currently suspended or those who have terminated their memberships.
You can also specify the start date of that membership!
Use cases:
Creating a campaign to welcome new members! You can indicate the start date was within the last 1 day!