There are many references that theologians think allude to the Antichrist, but descriptions have all been in metaphorical and/or apocalytic terms. I suppose the most popular explanation is that the Antichrist is one who will precede the Apocalypse/last days and who will be beautiful, magnificent, a great leader who will woo the masses with his charisma and cleverness but will lead them to their doom with a web of lies and deceptions. It is popularly thought that the Antichrist will be the incarnation of Satan himself.
Those who are 'in Christ' will recognize him, however, and will not be led astray.
This seems to be pretty much a uniquely Christian doctrine and is so cloaked in mysticism that it is impossible to accomplish a lot of agreement about it among most Christians, much less a firm informed conclusion.