What is the Kraken myth?

Excuse me, could you possibly elucidate the Kraken myth for me? I've heard of it in passing, but I'm not entirely certain of its origins or the deeper meanings associated with it. Is it a creature from Norse mythology, or is it something else entirely? What is its place in the pantheon of mythical beasts, and why does it persist in modern culture and crypto finance? Thank you for your time and assistance.