The CD and DVD are the versions of an optical disk, although they look similar in shape and are used to store data, they differ in size and manufacturing method. The players are even different because a DVD player needs to possess the ability to read a DVD and a CD player needs the ability to read a CD. A few main differences stick out between the players.
Most DVD players possess the ability to play any format of CD. This allows you to use only one device for both your audio and video needs. However, CD players do not play DVDs. This is typical because the laser in the CD player can not read the data on a DVD.