Essentially, AI spends most of its time collecting huge amounts of data and analysing it to find trends and observations about your audience. You might think that you know your audience already, but I can guarantee that AI knows it better.
It will be watching what they read, what they buy, and what influences them to do so constantly so that it knows exactly what Margaret in Bognor Regis had for breakfast, the news articles she read before work, the present she ordered for her niece and the rabbit hole of cat videos that she went down when she was on her lunch break. All of this forms a detailed picture of Margaret that tells us not only what she likes, but what she dislikes and what she responds best to.
Now, imagine you could have that kind of data about every possible member of your target audience. In a way, you can!