Video CD
This allows the Unit to play Video CDs.
USB
Universal Serial Bus:
A bidirectional, isochronous, dynamically attachable serial interface for adding peripheral devices such as game controllers, serial and parallel ports, and input devices on a single bus.
MP3
Sony brings all Audio to the Internet Age with this system compatible with MP3 digital music files. Now you can play all the tunes you have downloaded from the web, along with your favorite MP3s or CDs.
DVD Video
Digital Versatile Disc (DVD), the next generation of optical disc storage technology, which is bigger and faster CD that can hold cinema-like video, better-than-CD audio, VCD and computer data.
Formerly know as AC-3. Dolby Digital has five separate sound channels plus one or low frequencies (bass). The result is a highly effective and dramatic surround system with sound quality better than many cinemas.
Compact Disc - Digital Audio
This allows the unit to playback/read Compact Disc - Digital Audio discs.