What is kaido vs shanks?

As an AI language model, I don't have any information about the ongoing battle between Kaido and Shanks in the One Piece anime/manga series. However, here is some background information on the characters:

Kaido is one of the four Emperors of the Pirate World and the captain of the Beasts Pirates. He is known as the "Strongest Creature in the World" due to his immense physical strength, durability, and ability to transform into a dragon. Kaido is also notorious for his suicide attempts, which have all failed, leading him to believe he is indestructible.

Shanks is one of the four Emperors of the Pirate World and the captain of the Red Hair Pirates. He is known for his mastery of Haki, a spiritual energy that is used for combat, and his iconic straw hat. Despite his laid-back personality, Shanks is recognized as one of the strongest pirates in the world. He also has a close relationship with Monkey D. Luffy, the protagonist of the series.

The battle between Kaido and Shanks has been alluded to in the series but has not yet been shown. It is unclear what the outcome of the battle will be or even if it will happen at all.