As I understand it, a vaccine is where you inject some of the live or inactive virus and your body build antibodies for that. The covid "vaccine" puts mRNA (a type of DNA) that enters all your cells and gives them instructions to grow fake virus out of the cell wall and trick the body into a stress response to create antibodies. It really could be just semantics and maybe we can call this a vaccine technically but my point is really that this is nothing like we've every used before and things like effectiveness, side effects, etc. are still not known. I personally don't want to be injected with DNA at this point. They say it's harmless because the mRNA "should" leave once the body is done with it but that raises a lot of questions for me.