Based on data we have defined a preset of characteristics used to identify your target audience. This is a distinct combination of targeting settings (a profile) based on data from previous campaigns our technology ran, online behavior, interests, job functions, education, and employers. When selecting a profile, you automatically make use of these audiences.
After Meta announced the upcoming changes in their audience system, we proactively improved our profiling system to enhance our detailed targeting. Furthermore, the custom audiences are still active in the channels that allow such option (LinkedIn and Google Search).
Want to know more about choosing the right Job profile for your campaign you can take a look at this article: How to choose the right profile.