We've been talking about this a little bit lately, and just to clear up some hype I figured I'd post some informative links.

My semi-technical attempt at describing a "Glock": A Glock is a semi-automatic, polymer-framed, striker-fired, Quasi-double-action-only, centerfire handgun available in mid/major caliber offerings such as 9mm, .40 S&W, .357 SIG, .45 GAP, .45 ACP, 10mm and (not available in the US) .380 ACP. They are relatively lightweight, accurate, ergonomic and incredibly durable. They have no external manual safety equipped on them. They have 3 internal safetys that are all disengaged once you pull the trigger. They run on the theme that most double-action revolvers do: The best safety is inbetween your ears, keep your finger off the trigger until you are ready to fire.

From Wikipedia:

Glock is an Austrian weapons manufacturer (named after the founder Gaston Glock) founded in 1963 in Deutsch-Wagram, near Vienna, Austria.

Mainly known for being the manufacturer of polymer-framed pistols, Glock also produces equipment such as field knives and entrenching tools. The company started life as a manufacturer of curtain rods, then branched out into supplying the Austrian Army with machine gun belts, practice hand grenades, plastic magazines, field knives and entrenching tools. Since then, the company has added different options and accessories such as tactical lights and a quick-draw holster to its product line.

While Glock marketing materials spell the company name as if it were an acronym ("GLOCK"), newspapers in Austria, Germany, and the United States forgo the capitalization of all letters in the interest of readability.

and a quick picture of a Glock 23:

These weapons are fairly inexpensive (as far as quality handguns go) and have a very simple manual of arms. Because of this they are very popular in law enforcement agencies and have a very strong share in that market.

I may post more later but I'm a little tired now. If you have any questions please feel free to post them.