Does Airdrop required Bluetooth? Or does it use Bluetooth

Yes.

Share content with AirDrop on your iPhone, iPad, or iPod touch - Apple Support

AirDrop allows you to share media between supported iOS and MacOS devices. It uses Bluetooth and Wifi signals to send the files. However, you don't need to be connected to a Wifi or Cellular network in order to use it. All you have to do is make sure that both your Wifi and Bluetooth are turned on. Whether the device you are using is connected to anything through Wifi or Bluetooth doesnt matter.