Does Xbox 360 Read Game Discs as DVDs? No—Proprietary Format

No. Xbox 360 games use proprietary DVD-based discs (Xbox 360 Game Discs), not standard DVDs. They won't play in DVD players.

The console also supports digital downloads via Xbox Live Marketplace (stored on HDD, no disc needed).

So while discs look like DVDs, they're a custom format exclusive to Xbox 360.