Sometimes abbreviated as TT, the Turing test is a test developed by Alan Turing and published in the October 1950 paper, Computing Machinery and Intelligence. The test proposed if a computer's output responses were indistinguishable from a human, it could be said to be able to "think."
Turing's test involved putting a human interrogator in a room with two terminals, one connected to a human the other to a computer. If the interrogator couldn't tell the difference between the two during his communication, the computer passed and demonstrated human intelligence. So far, no computer has passed the test.