Switch
(1) A mechanical or electronic device that directs the flow of
electrical or optical signals from one side to the other. Switches with more than two
ports, such as a LAN switch or PBX, are able to route traffic.
With regard to a simple on/off switch, remember... Open is "off." Closed is
"on."
(2) In programming, a bit or byte used to keep track of something. Sometimes refers
to a branch in a program.
(3) A modifier of a command.
Mechanical and Semiconductor Switches The semiconductor switch (transistor)
performs the same function as an on/off light switch on the wall. Instead of being
manually closed, the switch is electronically closed by pulsing the semiconductor
material, which makes it conduct.