Who is Hermione Granger from Harry Potter and the Deathly Hallows and what is their importance?

Hermione Granger is one of Harry's best friends. She is also Ron Weasley's girlfriend. Hermione is studious, smart, and quick on her feet. She also knows many more spells that Harry and Ron do because she is a voracious reading. Hermione knows how to repair wounds, contort figures, and a number of other spells.