The fast of Ester is a Jewish fast day that occurs usually the day before Purim commemorating the fast that Esther called for in the story of Purim. More information on the Fast of Esther at http://www.answers.com/topic/fast-of-esther

Esther fasted for three days before asking for an audience with the king(Esther 4:15-16)

The Fast of Esther (Ta'anit Ester, or תענית אסתר‎) is a fast from dawn until sunset on the day before Purim, commemorating the three-day fast observed by the Jewish people in the story of Purim.

It was said those who fast come closer to God and she fasted to come in favour with and worship God.

In 2009: Taanit Esther (Fast of Esther) - March 9th Purim - March 10th Shushan Purim (ie. Purim in Jerusalem) - March 11th