Who is Dajjal?

In Islamic eschatology, Dajjal is an evil figure who is said to appear before the end of times as a false messiah. Dajjal is considered to be a major sign of the Day of Judgment, and his coming is prophesized in Islamic scripture.
According to Islamic belief, Dajjal will be a charismatic and powerful figure who will claim to be the messiah and will deceive many people with his miracles and false claims. He will have one eye, and his appearance will be deformed. Dajjal will travel the world and gain a following, but he will be ultimately defeated by Jesus, who will return to earth to defeat him.
It is important to note that the concept of Dajjal is not unique to Islam, and similar figures exist in other religions as well. However, the Islamic understanding of Dajjal is specific to the religion's teachings and beliefs.