Why don’t you read the very first line of the cd article I linked.

The compact disc (CD) is a digital optical disc data storage format co-developed by Philips and Sony to store and play digital audio recordings

What makes a cd digital is that it encodes digital information, ones and zeroes. That doesn’t change whether it was pressed at a factory or burned. There are optical discs that have an analog component like laserdisc, which is probably what the optical disc article is referring to, but that wasn’t on op’s list.

Go actually learn how the formats work before talking out of your ass.