Cat collars can serve many useful purposes, here are some common ones:
1. Identification: The cat's name, owner's phone number and other information can be written on the collar so that the owner can be found if the cat gets lost.
2. Prevent loss: Some collars are also equipped with GPS trackers, which can keep track of the cat's location at any time and prevent it from getting lost.
3. Injury prevention: Some collars are also equipped with bells, which can alert other animals or humans to prevent cats from being stepped on or hit.