[jincomplet]

Assalamu alaikum brothers & sisters.
Can anyone explain to me or point me in the right direction to learn about about gog & Magog?
Who & what is gog & Magog?
I understand dajjal, the signs & how the world is going to end, but just don't understand gog & Magog?
I was watching a lecture by sheikh imran hosien who was saying they are eurpoean Jews?
Or maybe I'm just watching too many lectures & confusing it all?..

Inshallah someone can help me.