VGA extension cable = male(plug) to female(socket) cable, brand new.
Cable length: 2m

NOTE: This cable is unshielded, so might possibly cause image degradation in some situations.

Some devices that often support VGA in:
Computer monitors
Projectors, many LCD, DLP & CRT projectors have VGA sockets.
Plasma TV
LCD TV
Projection TVs(not sure how common this is) = probably most common on recent LCD projection TVs
some CRT TVs also have VGA sockets, this is quite rare though it seems

Some devices that often support VGA out:
Computers
DVD players that support Progressive-scan, many recent DVD players support Progressive-scan, though not all have a VGA socket


About HTPCs (Home Theatre PCs) :
Some people use a computer as a source for playing DVDs on a projector, Plasma TV or similar. This is because a computer can supply excellent picture quality on these devices. It also means you can play games etc in high quality on the display.