The word "Dajjal" literally means great deceiver. It is also known as the "Anti Christ", it is important to note that other scriptures give reference to great evil happening in the latter days. This is truly what the Dajjal actually is.
The non Ahmadi Muslims take the dajjal to be a single person with one eye bulging out who has the word "kafir" written on his head who will claim to be a prophet.
We Ahmadis do not agree with such a unrealistic concept it is clear it is being metaphorically foretold to relate to
evil forces and whole nations specifically the west which is the land of materialism and love for the worldly things (money, greed, etc.) more than anything which ruins faith in God if it were to just be one
monster like person and everyone can see Kafir on his head even if they are unable to read, what logical sense would that make, everyone would obviously have 100% faith that this is a dajjal so how exactly will he deceive if everyone can see so clearly? The fact that the prophet (saw) said reading Surah Kahf will protect us from Dajjal shows that this "Dajjal" won't be killed with a physical sword, rather it will be through spreading true faith, true Islam to the corners of this Earth and removing the false notions which have crept into people of all religions, this obviously refers to spirituality/morals and it is most definitely the
nations of materialism which destroys spirituality which we must take heed and guard from constantly through prayers, and proper arguments which is contained in the Holy Quran, Hadith, and the works of the Promised Messiah (as) this was his job, to destroy the dajjal, which spreads falsehood and takes people away from the path of God, all this is from the materialism of the world which stemmed from the Christian nations giving rise to
irreligiousness and behavior taking away people from righteousness and instead promoting shamefulness, that's why the prophecy in the Muslim Hadiths of this Promised one was to
break the cross (meaning to
refute the false doctrine of Christianity, and bring true faith onto this Earth through arguments and the help of God, not through any sword),
kill the swine (meaning the Messiah would have the duty of dealing with the people who would be like Pigs who are great liars whom he destroyed with irrefutable arguments and proving the greatness of Islam) and to
abolish the Jizya meaning to end religious wars and dangerous violent behavior which crept into Muslim taught in the dark ages. please read
This to fully understand the Ahmadiyya view on the Dajjal in light of the Quran and Hadiths.
To learn more of the tasks about the Mahdi/Messiah (2 titles for the Same Person) please read