Moshiach, aka the Jewish Messiah, is a living human who will restore the true Israel, bring all the Jews to the land of Israel, reestablish the sanhedrin, rebuild the Holy temple (enabling us to fulfill all 613 laws of torah once again), ressurect the dead of Israel, and cause the world to recognize the God of Israel.

It is a pillar of faith for Jews (we have 13 fundamental beliefs as said by Rabbi Moses ben Maimon Zt"l) that we believe in the coming of the Moshaich and what he will do.

In the end of days, once the true Israel is created and Moshiach is king, Gog and Magog will wage war with Israel and try to destroy the true Israel (and all the Jews). After a very firce and violent battle with many losses, HaShem will save the Jews of Israel and destroy all evil in the world; Leviathan and Behemoth will appear and have a battle in which they both die, and people will sacrifice their bodies to HaShem. This will hapen by the Jewish year 6000.

Finally, once all that is through with, in the year 6000 it is guestimated, the seventh millennium will begin as an era of holiness, tranquility, spiritual life, and worldwide peace, called Olam Haba, where all people will know God directly.

The Jewish year 6000 begins 9/30/2239 7pm

Interesting, no?