Who is Ginny Weasley from Harry Potter and the Deathly Hallows and what is their importance?

Ginny Weasley is Ron's little sister and harry's girlfriend. She is still considered an underage wizard, but she is determined to join in the fight against Voldemort. Ginny joins the stand against Voldemort at her school, where she is a member of Dumbledore's Army. She is later caught trying to steal the Sword of Gryffindor from Snape's office.