Rachel Green is Monica's best friend from high school and therefore a key member of the group of Friends.  Rachel stars off as a waitress at the Central Perk where the gang hangs out, but later becomes a buyer at Bloomingdale's.

Rachel dates Ross on and off throughout the series and the two eventually have a baby girl, Emma, at the end of season eight.

Rachel Green Quotes

No. I can't. You're a totally different person to me now. I used to think of you as somebody that would never, ever hurt me. Ever. God, and now I can't stop picturing you with her. I can't. It doesn't matter what you say or what you do, Ross. It's just changed everything. Forever.

Rachel

Chandler: Just had me a little nubbinectomy. Yep! Two nipples, no waiting.
Monica: Wow. Just like Rachel in High School.
Rachel: What?
Monica: Come on! Come on, I was kidding! It was such an obvious joke!
Chandler: That was an obvious joke; and I didn't think of it. Why didn't I think of it? The source of all my powers! Oh dear God, what have I done!

Friends Quotes

Kate: That infomercial! For the milk carton spout thing! You're the guy who doesn't know how to pour milk!
Joey: I actually can pour milk. But I got you believing that I couldn't. See, that's acting.
Kate: Right at the end, you choked on a cookie.
Joey: Yeah, that was real.

Oh! I see. And I've sort of been maintaining my amateur status so that I can waitress in the Olympics.

Rachel