If you are looking for an answer to the question What is Artificial Intelligence? and you only have a minute, then here's the definition the Association for the Advancement of Artificial Intelligence offers on its home page: "the scientific understanding of the mechanisms underlying thought and intelligent behavior and their embodiment in machines."
However, if you are fortunate enough to have more than a minute, then please get ready to embark upon an exciting journey exploring AI (but beware, it could last a lifetime) …
Uhr, Leonard | Vossler, Charles
The typical pattern-recognition program is either elaborately preprogrammed to process specific arrays of input patterns, or else it has beendesigned as a tabula rasa, with certain abilities to adjust its values, or "learn."One mode of operation of the present program is to begin with no operators at all. In this case operators are initially generated by the program at a fixed rate until some maximum number of operators is reached. The continual replacement of poor operators by new ones then tends to produce an optimum set of operators for processing the given array of inputs. Reprinted in Fegenbaum & Feldman, Computers & Thought (1963).Proc. Western Joint Computer Conference, 19: 555-570.