Answer: Customer Match relies on your own data instead of a remarketing tag
Step-by-step explanation:
The Remarketing tags utility of Gogle Ads targets customers who have already been to a site before by adding them to a remarketing list. If the advertiser does not want to do this, they can use the Customer Match utility.
This will enable them to use both their offline and online data to reach out to people through the information that those people have already shared with the advertiser. The ads will then target those sort of people and others like them based on the data shared with the advertiser.