Here are four ways to create a Custom Audience:

The first requirement of the Ad Set is for you to identify the type of people whom you want to serve your ads to. Again, even though Facebook has a massive audience, you cannot just show your ads to everybody

Audience: Identifying who you want to see your ads

Each campaign objective has a very specific target audience. This means that your target audience will depend heavily on what your advertising goal is. The more specific your target audience is, the more effective your campaign will be.

Location, age, and gender are essential targeting criteria which are fundamentals in the 'Audience' form. However, the versatility of Ads Manager allows you to craft who you want to serve your ads to based on the following: Custom Audience Targeting You can create a Custom Audience based on the people who already have interactions with your online store, whether it's inside or outside of Facebook.