cd: Compact disc
Compact discs (or CDs) are optical discs used to stored data. It was initially planned to be only for playing back sound recordings and music, although more CD formats began to be developed. The most common CD formats are: CD-ROM, CD-R and VCD.
http://www.webopedia.com/TERM/C/CD_ROM.html
http://searchstorage.techtarget.com/definition/CD-R
http://en.wikipedia.org/wiki/Video_CD
- CD-ROM - Computers can read these, however, you cannot edit/write on them (Read-Only Memory)
- CD-R - These allow you to write data onto it once, then read it as many times as you want (Recordable)
- VCD - Used for a very short period of time, the VCD allowed you to record and play videos from an optical disc (Video Compact Disc)
http://www.webopedia.com/TERM/C/CD_ROM.html
http://searchstorage.techtarget.com/definition/CD-R
http://en.wikipedia.org/wiki/Video_CD