As we mentioned earlier the emerging of the Dajjal is the first of the major signs of the approach of the Day of Judgment. He is also called al-Masih ad-Dajjal (which means he is a great deceiver, because he is a liar blasphemer who sweeps through the land with speed).
The way in which he will travel the world is strange and unlike our ways.
He will travel the world with a tremendous ease, which is given to him by Allah the Exalted. He will travel the earth from all directions in just one and half years, spreading corruptions everywhere. He will gain access to every place with the exception of entry to Makkah and Madinah, in Arabia. This is because at every gateway thereof will be an angel guarding the entry with his sword drawn, making the Dajjal flee at their sight. His travels will be eased in a strange way, he will lead people astray here and there; he will say to people: “I am your great lord.” He will deceive them in many ways. Those whom Allah had willed for them to die as blasphemers will believe in and follow him.
The one eyed impostor is a human from the Children of Adam, apparently he is from the Children of Israel. He is described as having one eye, while the other one is totally flat, as well as being a great deceiver and liar. This is why he is also called ‘the one-eyed Imposter’, and in Arabic “A^war Ad- Dajjal”, which means the same.
Amazingly, he is now chained by angels on an island. The whereabouts of this island is unknown to anyone. He cannot emerge before his due time. He has been imprisoned there for a long time as it was illustrated by the incident told by a Companion of Prophet Muhammad may Allah raise his rank.
Tamim Ibn Aws tells that he and other Companions were sailing when their boat went astray leaving them lost in the ocean for one month. The boat was drifting deeper into the ocean when it stopped at an island. There, they were met with the one-eyed Imposter. The Companion described him to the Prophet as having a huge body and obviously knows the Arabic language, since he communicated with him in Arabic. He introduced himself to them and asked them many questions. Among his questions he asked if the prophet of an Arab origin – meaning Prophet Muhammad – has come forth yet. They said: “Yes.” The purpose of his question was to measure the remaining term of his imprisonment before his freedom. He is aware that his release will be one of the signs indicating the approach of the Day of Judgment, which will happen in a time after the Revelation of Prophet Muhammad.
Then the description of the Imposter was revealed to Prophet Muhammad may allah raise his rank and it was the same as that Companion mentioned.