Just because it sounds so professional i stole this exerpt from everything2.com
"Electrical tape is slightly stretchy, insulating, fire resistant, vinyl adhesive tape used primarily to cover exposed electrical conductors, either to protect them from moisture or protect other equipment or people from coming into contact with them.
Electrical tape is generally applied by spinning the roll around the exposed wire in the direction that the tape comes off the roll. This applies some tension to the application as the adhesive pulls free from the roll, which keeps the tape tight as it is applied."
Other uses for electrical tape include:
* reducing overtones and pings on snare drums by applying it on the batterhead
* colour coding wire
* insulating wires
* used by rugby players to tape back their ears
* temporarily bundling things together (as it easily unsticks)
* replacing lost colours on rubik's cubes
For uses of other tapes, check out this web page: http://www.doityourself.com/stry/ducttape