Artificial intelligence (AI) has been defined as the study of artificial systems that exhibit intelligent behavior. Research in AI is aimed either towards yielding greater understanding of how naturally intelligent systems, like human brains, function (i.e. a subdomain of cognitive psychology) or at building systems like computer programs or robots, say, that behave in apparently intelligent ways (i.e. a subdomain of engineering). In this overview, some important facets of AI research are examined.