Huntress was Helena Wayne, the daughter of the Batman and Catwoman of Earth-Two (an alternate universe).
Helena began her superhero career when a criminal blackmailed her mother into resuming action once again as Catwoman (which eventually led to her death). Helena decided to bring the criminal responsible to justice. She created a costume for herself and used some weapons from her parents equipment (including her crossbow). Helena set out to bring in the criminal. After accomplishing this, Helena decided to continue to fight crime. Under the code name the "Huntress."
Helena was killed while attempting to save the lives of several children. After Crisis ended, Helena Wayne's existence (like that of her parents and Earth-Two's Dick Grayson) was retroactively erased from the remaining Earth and the world no longer remembered her.
The Modern Age (Huntress = Helena Rosa Bertinelli/ Hellena Janice Bertinelli)
Batman considers Huntress to be too unpredictable and violent. But others in the Batman family could disagree. Nightwing had a brief romantic fling with Huntress. But her and Tim Drake share a good professional relationship.
Batman sponsors Huntress's membership in the Justice League. For some time Huntress was a respected member of the League. Under the guidance of heroes such as Superman, Huntress grew in confidence. But was forced to resign after Batman stopped her from killing the villain Prometheus.
Nick: I Just Unlocked The Huntress Level On My Nintendo DS Lego Batman Game.
John: Your such a nerd, & who the fuck is huntress.
Nick: Only The Best Superhero Known To Human Kind.