A dip switch is a set of small switches found on computer hardware that can be turned to the ON or OFF position as shown in the below picture. Like computer jumpers, dip switches are used to configure computer peripherals such as hard drives, modems, sound cards, and motherboards. Today, with most computers using PNP, most hardware no longer requires manual configurations, so dip switches are not as common.
Caution: When changing a dip switch on any device, the device and your computer should be turned off first. Also, whenever inside the computer you should always be aware of ESD.
Also see: Jumpers