Short answers, pulled from the story.
The name Eris derives from the ancient Greek noun eris which carries the stem erid-. This root means strife or discord. Scholars have debated its origin for centuries without finding strong evidence linking it to verbs meaning to raise or stir.
Hesiod's Theogony describes Eris as the daughter of Nyx the primordial goddess Night. She was born without a father among many loathsome children including Moros representing Doom and Thanatos standing for Death.
Eris threw a golden apple among wedding guests at Peleus and Thetis union with the inscription For the fairest in ancient Greek. Hera Athena and Aphrodite each claimed the object initiating a quarrel leading to the Trojan War.
Hesiod contrasted two distinct Erises in Works and Days where the first was blameworthy fostering evil war and conflict. A second Eris worthy of praise existed separate from the first created by Zeus to foster competition.
Mid-sixth-century BC appearances appear on Chest of Cypselus and black-figure cup Berlin F1775. Cup images show normal appearance apart from wings and winged sandals while fifth-century BC red-figure calyx krater upper section shows Eris facing Themis animated discussion.