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1.
One of the best comic companies ever.
Average Dumbass: Hey dude, Batman is from Marvel Comics right?
Smart Person: No you dumbshit he's from DC Comics
by Joey1214 January 25, 2009
 
2.
One of the "big two" comic companies (the other being Marvel Comics). DC is responsible for such cultural figures as Superman, Batman and Robin, Wonder Woman, Flash, Green Lantern and Aquaman, although there are hundreds of heroes and thousands of characters in the DC Universe. They are mostly known for their superhero comics in the "DC Universe or DCU" although they do have other divisions, including the major imprint Vertigo Comics which focuses on comics aimed more for adults with many standalone series and the (recently closed and as of August 2011 planned to be integrated into the main DCU) Wildstorm, which had many creator owned superhero comics as well as a manga division.

Starting in 1985 with the famous Crisis On Infinite Earths DC has had many large scale crossovers in their multiverse that retconned large parts of continuity, reaching a peak in the late 2000's when they had three major retcon crossovers starting in 2005 and finishing in 2011 (with possibly more to come). Good job on messing up your continuity so much DC.

One funny thing about DC Comics is that it's not the original company name and the "DC" was taken from one of the more popular (and still ongoing) lines called Detective Comics, which is the comic that introduced Batman. This means technically the full name is Detective Comics Comics.
Person 1: Hey, I recently heard DC Comics is rebooting the DCU. It's now going to have a multiverse with 374 universes, Wonder Woman is now a Martian and the Flash is a talking bear! It's called Ultimate Final Last Crisis 2.0!
Person 2: Ugh. I love DC. It has great characters. But they have too many big retcons. I wish they'd just be stricter on maintaining continuity. Is it any wonder why so many people who want to get into comics feel intimidated and don't know where to start?
by Mr. ZAP August 05, 2011
 
3.
The Best example of modern day literature ever created
DC Comics kicks Marvel's Ass!!!!!

Superman, Batman, Robin, Red Robin, Green Lantern, Green Lantern Corps
by DCFan2448 August 25, 2010
 
4.
The comic book company responsible for Batman and Superman, to some the greatest to other a close second behind Marvel.

Soon to appear in the next Mortal Kombat game.
Who made the batman comics?
dc comics duh....
by crimson Fox October 20, 2008