For Windows users, the most common DVD-playing software is Windows Media Player or RealPlayer. For Mac users, a DVD usually automatically plays through DVD Player.
There are some instances, when a user cannot simply put in the DVD and let it play. If the DVD does not immediately play, the user should check the PC to see whether it actually contains a DVD drive and not just a CD drive. A DVD drive and CD drive can sometimes be combined into one device.
Another reason a DVD may not play is that the PC could be missing a codec to play certain DVD file types. the user can find and download these easily from websites such as Free-Codecs.com. If that still fails, the user could plug in a USB external DVD player.