Presentation Players read and display Powerpoint files and other presentaion software and display via a business display devices such as monitors, TVs or projectors.
Media Players read media files (mp3, video files) from a PC or network and play back on a home audio / entertaiment system or device.
Analog Source streamers play the role of a wireless link between a signal source and the destination (Eg. allow you to connect VCR and TV without wires).