Artificial intelligence is the broad umbrella term. It covers everything from the spam filter in your inbox to the chatbot that drafts your emails. What unites them is the approach: instead of a programmer writing out every rule, the system learns patterns from large amounts of data and uses them to handle new cases.
In everyday use, "AI" usually means the helpful, narrow kind that is good at one job. It is not the all-knowing machine of the movies, and knowing that difference helps you judge what it can and cannot do.