Armageddon is, according to the Bible, the site of a battle during the end times, variously interpreted as either a literal or symbolic location. The term is also used in a generic sense to refer to any end-of-the-world scenario.

According to some premillennial

Premillennialism

Premillennialism in Christian end-times theology is the belief that Jesus will literally and physically be on the earth for his millennial reign, at his second coming. The doctrine is called premillennialism because it holds that Jesus’ physical return to earth will occur prior to the inauguration...

 Christian interpretations, the Messiah

Messiah

A messiah is a redeemer figure expected or foretold in one form or another by a religion. Slightly more widely, a messiah is any redeemer figure. Messianic beliefs or theories generally relate to eschatological improvement of the state of humanity or the world, in other words the World to...

 will return to earth

Second Coming

In Christian doctrine, the Second Coming of Christ, the Second Advent, or the Parousia, is the anticipated return of Jesus Christ from Heaven, where he sits at the Right Hand of God, to Earth. This prophecy is found in the canonical gospels and in most Christian and Islamic eschatologies...

 and defeat the Antichrist

Antichrist

The term or title antichrist, in Christian theology, refers to a leader who fulfills Biblical prophecies concerning an adversary of Christ, while resembling him in a deceptive manner...

 (the "beast"

The Beast (Bible)

The Beast of Revelation, may refer to two beasts in the apocalyptic visions by John of Patmos, as written in the Book of Revelation. The first beast comes from "out of the sea". The second beast comes from "out of the earth" and directs all peoples of the earth to worship the first. This first...

), Satan

Satan

Satan , "the opposer", is the title of various entities, both human and divine, who challenge the faith of humans in the Hebrew Bible...

 the Devil

Devil

The Devil is believed in many religions and cultures to be a powerful, supernatural entity that is the personification of evil and the enemy of God and humankind. The nature of the role varies greatly...

, in the battle of Armageddon. Then Satan will be put into the "bottomless pit" or abyss

Abyss (religion)

Abyss refers to a bottomless pit, to the underworld, to the deepest ocean floor, or to hell.The English word "abyss" derives from the late Latin abyssimus through French abisme , hence the poetic form "abysm", with examples dating to 1616 and earlier to rhyme with "time"...

 for 1,000 years, known as the Millennial Age.