introduction:  

  The intellectual roots of AI, and the concept of intelligent machines, may be found in Greek mythology. Intelligent artifacts appear in literature since then, with real (and fraudulent) mechanical devices actually demonstrated to behave with some degree of intelligence. Some of these conceptual achievements are listed below under "Ancient History." After modern computers became available, following World War II, it has become possible to create programs that perform difficult intellectual tasks.

  From these programs, general tools are constructed which have applications in a wide variety of everday problems. Some of these computational milestones are listed below under "Modern History." artificial intelligence is the science and engineering of making intelligent machines, especially intelligent computer programs.                                               

It is related to the similar task of using computers&to understand human intelligence, but AI does not have to confine itself to methods that are biologically observable. Intelligence is the computational part of the ability to achieve goals in the world. Varying kinds and degrees of intelligence occur in people,

many animals and some machines.More