What is Justice League in DC universe?

Justice Leagues is the team of superhero in DC comics uniververse. They are the earth’s first line of defence against the force or threats too large for humanity to face alone.
Different comic version (volume) consist some different members. Mentioned are the common members in all versions
1.) Batman
2.) Superman
3.) Aquaman
4.) WonderWoman
5.) The Flash
6.) Martian Manhunter
7.) Green Arrow
8.) Atom
9.) Hawkman
10.) Black Canary
11.) Hawkgirl.