Most promising applications of artificial intelligence?

What are some of the most promising applications of artificial intelligence that you believe will have a significant impact on society in the near future, and what are some of the potential challenges that we may need to address as AI technology continues to advance?
A lot of information articles and posts in social networks studied, but always the information is very different, so it is hard to come to a consensus. I would like to get a constructive answer to this question, thank you in advance.

Note: URL of one site studied by the poster removed by moderator.