Lookalike Audiences are user groups identified by platforms like Meta or Google that share characteristics and behaviors with a source audience (for example, your existing customers). Algorithms analyze hundreds of signals to find people with a high likelihood of converting.
You upload a list of 500 customers who purchased in the last 6 months to Meta Ads. The platform builds a 200,000-person lookalike audience that delivers a 4.5x ROAS — twice as good as interest-based audiences.