Wonder Woman, known also as Diana of Themyscira, was the princess of the Amazons and one of the original seven founders of the Justice League.
When "Man's World" came under attack by the Imperium, Diana left Themyscira and joined Hawkgirl, Green Lantern, and the Flash in the initial battle before all seven (Batman, J'onn J'onzz and Superman) took on the Imperium and defeated them.
Diana provided additional muscle to the Justice League lineup, besides Superman. She was adept at providing cover for her allies, utilizing her "bullets and bracelets" routine to deflect artillery fire, lasers, and Green Lantern-style energy beams and constructs.
Diana was "blessed by the gods" with amazing speed and strength. She also possessed the power of flight, silver bracelets that could deflect all sorts of projectiles, and an indestructible golden lasso.
Also of note was her golden lasso (which wasn't included?!), which proved useful on multiple occasions for seizing various objects. It also contained the power to force the truth out of anyone wrapped in it.