What is the difference between CD and DVD audio?

CDs play on two 16 bit 44.1 kHz channels and work on both DVD and CD players.

DVD audio (DVD-A) requires a DVD player to work. It uses higher sample rates - up to 24 bit 192 kHz with stereo, but generally uses 24 bit 96 kHz - and can work on anything ranging from mono to 5.1 channels. That is not DVD-V.

The difference is in terms of audio quality since the DVD-Audio format has 7 times more storage capacity then a regular CD-Audio.

This means that you can actually hear the audio content on a DVD-Audio the best possible way ever since both the sample rate (192kHz) and the bit depth resolution (24bps) are higher then a regular CD-Audio (44.1kHz, 16bps) and would actually exceed the human hearing capability.