What are Facebook Ads?

Facebook Ads are advertisements that can be played on Facebook.

To ensure that Facebook ads are used in a targeted manner, it makes sense to define the target group in advance and to play the ads only to suitable people. This reduces costs and at the same time increases the probability that a desired goal is reached. 

The practical aspect of this is that since every Facebook user provides data and sometimes even publishes their own interests, the ads can be played out to the right target group without much effort.