I assume the question is about a DVD drive to connect to an iMac, like an Apple SuperDrive. I have an inexpensive OWC unit connected to my iMac that works well enough on the odd occasion when I need to use it. https://eshop.macsales.com/item/OWC/MRSSDSDT8X/
Apple still sells the USB Superdrive too. [URL="https://forums.imore.com/e?link=https%3A%2F%2Fapple.sjv.io%2Fc%2F221109%2F473657%2F7613%3FsubId1%3DUUimUvbUpU3020719%26subId2%3Dvbim%26u%3Dhttps%253A%252F%252Fwww.apple.com%252Fshop%252Fproduct%252FMD564LL%252FA%252Fapple-usb-superdrive&token=vtn4m5bX]https://www.apple.com/shop/product/MD564LL/A/apple-usb-superdrive[/URL]