Do you have to buy the games on a VR?

Hello there! I'm curious about something related to virtual reality (VR) gaming. I've been hearing a lot about the immersive experience that VR gaming can offer, and I'm quite intrigued. However, I'm a bit unsure about one thing: do you have to buy the games specifically for VR, or can you play regular games on a VR headset as well? I understand that some games are designed specifically for VR, but I'm wondering if there's a way to enjoy my existing game library in a VR environment. Could you shed some light on this for me? Thanks in advance for your help!