Some cat owners choose to use collars on their kitties. If your kitty goes outside, I believe this is an absolute necessity. Even if they are indoor only, you might want to consider an ID collar, just in case kitty accidently gets outside. A collar with ID tag and rabies tag will greatly increase your chances of being reunited with your cat if they get lost or in trouble.
If you choose to use a collar on your cat, PLEASE use a breakaway collar. These collars are made with a clasp that snaps apart easily if the cat becomes hung up to prevent strangulation. I speak from experience. When I was a younger, my orange tabby cat went missing. My grandpa found him a day later. He had tried to jump a fence and got his collar caught on the top. He was already dead when we found him. I cried for days. Ever since, I have asked people who collar their cats to use breakaway collars for safety’s sake.
I am attaching a link to a nice blog post on choosing a collar for your new kitten. The earlier you start them out, the easier it is to get them used to wearing one!