Tor isn't the best ever privacy browser? They why we need VPN.huh?
Actually, for extra protection and more flexibility, Tor and a VPN can be combined.
Traffic can be encrypted by both and then channeled first through the Tor network and then over a VPN (VPN over Tor) or vice versa (Tor over VPN).
Tor is for anonymity, and a VPN is for privacy.
NordVPN is nice according to me. It is best VPN for Tor. No logs, huge server network, strong security.