A DVI cable is a lead used for transmitting video signals. It is most commonly used to link computers with monitors. However, it is now used on some high definition televisions.
VGA today generally refers to the type of cable used to carry the display signals, regardless of the actual graphics system being used. It’s characterized by 15 pins on the plug in three rows of five. The plug also has two screws, one either side of the pins, which secure it into place in the socket. These screws have ridged edges meaning they can be tightened and loosened by hand rather than needing a screwdriver.