When Google first introduced Customer Match in 2015, it allowed search advertisers to create and target custom audiences based on a list of user email addresses in their Search, Gmail, and YouTube campaigns within AdWords. As advertisers discovered powerful best practices for using Customer Match, it became a sensation and Customer Match was expanded to Shopping Campaigns in 2016.
As great as customer match is though, not all advertisers have a large list of emails for their customers or prospects to target their ads. Even when they did, Google wasn’t able to match every email to a user on their network.
