What is the difference between a sister and a nun?

The terms "nun" and "sister" are often used interchangeably. However within Roman Catholicism, there is a difference between the two. Here's a simple summary of the differences.
A Nun's Life

What is the most unexpected part of being a sister?

https://traffic.libsyn.com/anunslife/RNC-AS127-jan-16-2013-nuns-on-most-surprising-about-religious-life.mp3
Podcast Recorded:

This clip is from our Ask Sister podcast episode 127, recorded live on January 16, 2013. Hear the full podcast at AS127.

IGF024 In Good Faith with Brother Mickey McGrath, OSFS

https://traffic.libsyn.com/anunslife/IGF024_In_Good_Faith_with_Brother_Micky_McGrath_OSFS.mp3
Podcast Recorded:

IGF024 In Good Faith with Brother Mickey McGrath, OSFS, recorded live on December 5, 2012. Produced by aNunsLife.org Ministry. Topics include: vocation as artist and religious brother, painting the saints in everyday life, saved by beauty.

IGF022 In Good Faith with filmmaker Mary Fishman

https://media.libsyn.com/media/anunslife/igf022-oct-24-2012-Fishman.mp3
Podcast Recorded:

IGF022 In Good Faith with filmmaker Mary Fishman, recorded live on October 24, 2012. Produced by aNunsLife.org Ministry. Topics include: the making of the movie Band of Sisters, the sisters’ stories, changing hearts and minds through film.

IGF018 In Good Faith with Carole Garibaldi Rogers

https://media.libsyn.com/media/anunslife/igf018-in-good-faith-rogers.mp3
Podcast Recorded:

IGF018 In Good Faith with oral historian Carole Garibaldi Rogers, recorded live on June 13, 2012. Produced by aNunsLife.org Ministry. Topics include: what is oral history, sisters’ stories of change after Vatican II, a spirituality of listening.