Takes requited voltage, optical intensity, frequency or any other type of data and converts it into video or audio
Jack Ports
Main Speaker Out (Green)
Where you plug your speaker or your headphones
Microphone (Pink)
Where you plug voice input devices
Line in (Blue)
Connects to external devices like DVD/MP3 players so that you can use them to play audio through your computer speakers
Line out
Allows you to play sounds out of your PC through a connected DVD/MP3 player
Rear out
For rear speakers in a surround sound system
Analog/digital out
Special digital connection for external digital devices or digital speaker systems