Tailscale is a VPN (Virtual Private Network) which is different than a VPS (Virtual Private Server).

ETA: Oops. I see your question has been answered multiple times. It seems you are a beginner at selfhosting and trying to get a grip on what's necessary to start and trying to wrap your brain around all the acronyms. There is absolutely no shame in being a beginner. Everyone in this community was a beginner at some point in their life. So, don't be bashful about asking questions. I've found the folks here to be patient and helpful.