Artemis is the daughter of Zeus and Leto, and the twin sister of Apollo. She was the patron and protector of young girls, and was believed to bring disease upon women and relieve them of it. Artemis was worshiped as one of the primary goddesses of childbirth and midwifery along with Eileithyia. Much like Athena and Hestia, Artemis preferred to remain a maiden and is sworn never to marry.
Artemis was one of the most widely venerated of the Ancient Greek deities and her temple at Ephesus was one of the Seven Wonders of the Ancient World. Artemis' symbols included a bow and arrow, a quiver and hunting knives and the deer and the cypress were sacred to her. Diana, her Roman equivalent, was especially worshiped on the Aventine Hill in Rome, near Lake Nemi in the Alban Hills, and in Campania.
Artemis is one out of the five Goddesses and Hermes, to grant Wonder Woman her powers and abilities. Artemis granted Wonder Woman eyes of the hunter and unity with beasts.
In the new 52 Artemis helped Apollo bring Zola to Hera in exchange for Apollo gaining the empty throne of Zeus. She and Apollo battled Wonder Woman, Hermes and Lennox. In the fight she severely wounded Lennox and defeated Hermes. She later fights Wonder Woman and notes Diana doesn't have the dark edge to beat her before they are interrupted by Hera throwing Zola from Mount Olympus, before they go at each other again, Diana has removed her bracelets and effortlessly beats Artemis before bargaining her life for that of Zola and her child.
Like all of the Gods, this version of Artemis appears drastically different from the normal perception of the Greek Gods. In Artemis' case she has appeared as a nearly featureless humanoid with huge antlers growing from her forehead when she appeared before her fellow deity Demeter. But when she and her brother confronts Diana, Lennox and Hermes, she appears as an ablaster skinned woman (looking as if she was made of lunar rock) with no pupils or hair color, wearing a fur rimmed leather outfit and riding a large three-wheeled motorcycle that flies, her appearance may depend on the presence of the moon the same way it appears to dictate Apollo, the Sun God's, appearance.