Padma Patil is the identical twin sister of Parvati Patil, one of Harry's classmates in Gryffindor. Padma, however, was sorted into Ravenclaw. In Harry Potter And The Goblet Of Fire, she attended the Yule Ball with Ron Weasley at the urging of Parvati's
date, Harry Potter. When he begged her to find a date for Ron. Padma wasn't excited to
have Ron as a partner since Ron wouldn't want to dance with her. Their
classmate Dean Thomas
marvels that Harry and Ron managed to go to the dance with the two
best-looking girls in their year, a sentiment shared by Dean's friend Seamus Finnigan.
In Order Of The Phoenix, Padma became a prefect for Ravenclaw. She also joined Dumbledore's Army along with Parvati.
The Patils' names and appearance in the movies imply that the characters are of Indian descent. In Sanskrit Padma means "lotus", which symbolises divinity and purity, because of its nature and birth in dirty mud water.
Source: Wikipedia