Lookalike Audiences allow Meta to find new people who share similar characteristics with an existing audience you provide — such as your past purchasers or website visitors — making it a powerful way to reach new, relevant people who are more likely to be interested in your business. This lesson covers how to create a Lookalike Audience, choosing the right source audience (quality matters more than size), and adjusting the similarity percentage (1% being most similar, up to 10% for broader reach) based on your campaign goals.