The appearancw of Ad-Dajjaal (the Liar, Antichrist) will be one of the major signs of the nearness of the Day of Judgement. He will have the power to perform unusual feats in order to deceive people and will claim divine attributes. Between his eyes will be the three letters kaa, faa and raa, meaning kaafir, or disbeliever.
The Prophet (pbuh) described him as having "a huge body, red complexion, curly hair and blind in the right eye; and his eye will look like a protruding grape." (Reported by Al-Bukhaaree)
He will travel all over the world but will not be able to enter Makkah and Madeenah because these sacred cities will be guarded by the angels who will prevent him from entering them. Some of his extraordinary acts will be that he will command the clouds which will then pour down with rain and will cure those born blind and the lepers; he will also cut a youth into two halves with a sword, and the youth will come to life with a smile when he commands him so.
The Prophet (pbuh) said, "No prophet was sent but that he warned his followers against the one-eyed liar (al-Maseeh ad-Dajjaal). Beware! He is blind in one eye, but your Lord is not so; and there will be written between his (i.e. Maseeh ad-Dajjaal's) eyes [the word] kaafir (disbeliever)." (Reported by Al-Bukhaaree).
He will also have water and fire with him; what would seem to be fire would actually be nice cool water, and what would seem to be water would in fact be fire. Eventually, Prophet 'Isaa [Jesus] will come again and defeat the Dajjaal and kill him.
The prophet (pbuh) said, "Whoever memorizes the first ten verses of Surat Al-Kahf will be protected from the Dajjaal." (Reported by Muslim)
