Tree rotation is a way of arranging the parts of a tree so that it looks different, but still follows some rules about how all of the parts should fit together. To rotate a tree, you would first pick one of the parts, which we'll call a "branch". Then, you would move that branch and the branches connected to it around, making sure they all stay connected, like a jigsaw puzzle. Lastly, the branches that used to be connected to the branch you moved will now be connected to different branches.