Justice League is really only a part of the characters that make up DC. It has other characters/groups that have nothing to do with the League. At least not directly anyway.

Were there some specific characters that you were wondering about?

This should help you out At least for a start. This might be worth a look too.

oh realy
yeah like um:
Nightwing
Bane
Parallax
darkseid
who are those?

nightwing: the 1rst robin dick grayson. he is divorced from his husband batman now and move to bludhaven.... - hero

bane: batman enemy - villain.. the one who broke his back.... u sure you dont know?

parallax: ex green lanter hal jordan, read zero hour. villain... long history

darkseid: enemy of superman among others,.... apokolips... thats sound familiar to you in any way? - villain

To actually answer the question: The DC Universe is the central world inhabited by DC characters, including, but not limited to, the Justice League.

Contextually it could mean anything from the central reality (as opposed to alternate worlds with alternate versions of characters), to the core brand (versus unrelated imprints like Vertigo or CMX), or just the conceptual parameters by which any fictional landscape are defined. It just so happens those parameters are shared by thousands of characters.

In short; DC Universe is the world of the DC heroes and villains.

yea they do sound familiar, i think that i just didnt know there name but i know who they are..thank you

Yeah, there's tons of awesome DC characters. The Justice League is most likely what DC is mostly known for though. But they have other divisions, characters and plots too.

oh thanx, im a dork, i dont know why but , i was confucing Dc with marvel.

dont worry, it happens. there is worse things...

Here's a few notables...

Who's Who in the DCU?

This really makes me think of how much of an impact Marvel has on pop culture. I tried to think of more than Batman, Robin, Superman, and Wonder Woman and all I can think of is Green Lantern. If I were to name as many Marvel characters that I can without stopping I would get at least 15 before having to dig deep.

Flash!

and speaking of Flash. One of my favorite comics during my comic days was Impulse. I think that's been discontinued for a while now but I liked that comic. Or at least Humberto Ramos' work.

Poison Ivy!

It seems easier to name Villans in the DC Universe rather than the heroes.