Cats are naturally curious animals, so keeping them away from the Christmas tree can be a challenge. One way to keep them away is to use some deterrents like motion-activated air canisters or citrus-scented sprays. Additionally, you can create a physical barrier around the tree using aluminum foil or double-sided tape on the base. Finally, you can try offering your cat some alternative toys or activities to occupy their attention, such as a scratching post or a catnip toy.