The CD player, otherwise called optical disk, is a device that can read CD (Compact Disc).
It dipose a reading lens, which can read CD thanks to a laser diode.
Is a removable medium flat and circular transporer which allows data. Its size is typically of the order of 700MB (Mega Bytes).
See CD, the capacity is larger than the CD, the DVD can store up to 6 times more, about 4.7 GB (Giga Bytes).