She got her start on the Great White Way as an understudy for the role of Sandy Dumbrowski in the 1996 Broadway production of Grease, and she has since distinguished herself in the title role of the musical Thoroughly Modern Millie, as Millie Dillmount, a girl who comes to the big city to marry a wealthy man. She also played Jo March in a 2005 production of Little Women, Janet Van De Graaff in the musical comedy The Drowsy Chaperone, and Princess Fiona in Shrek, the Musical. Among other roles. :-)
More recently, she played Violet Karl in the 2014 Broadway production of Violet, a musical whose title character travels to Oklahoma on a bus to be healed of a disfigurement caused by a childhood accident. Ms. Foster played the role without prosthetics, encouraging the audience to imagine her disfigurement.
Sutton Foster has also made a move to television; "Younger," a comedy-drama about a middle-aged single mother who can only get a job after making herself over to look like a twentysomething and then gets hired as a publishing assistant. Sutton Foster plays Liza, the middle-aged mom in question. The series premiered on TV Land earlier this month (January 2015).
"Younger" is based on the novel of the same name by New Jersey author Pamela Redmond Satran. Full disclosure requires me to state that I know Ms. Satran. But I don't know Sutton Foster.