Artificial intelligence, the study and engineering of intelligent machines capable of performing the same kinds of functions that characterize human thought. AI programs tend to be highly specialized for a specific task. They can play games ,predict stock values, inerpret photographs, diagnose diseases, plan travel itineraries, translate languages take dictation, draw analgies, help design complx machinery, teach logic make jokes compose music create deawings, and learn to do tasks better. AI programs perform some of there tasks well .In a famous example, a supercomputer called Deep Blue beat world chess champion Garry Kasparov in 1997.AI progarms can make medical diagnoses as well as, or beyyer than , most human doctors, AI  programs have been developed, so they can analyze the disease symptoms , medical history, and laboratory test results of a patient and then suggest a diagnosis to the physician.To match everything that people can do ,AI system would need to model the richness and subtlety of human memory and common sense, Many of the mechanisms behind human intelligence are still poorly understood, and computer programs can simulate the complex processes of human hought and cognition only to a limited extent, Even so , an AI system does not necessarily need to mimic human thought to achieve an intelligent answer or result, such as a winning chess move, as it may rely on its own superhuman computing power