Five Megillot

Five Megillot are five books found in the Hebrew Bible (also called Tanakh) under Ketuvim, which are read out during Holy Days of Judaism. They are:
Song of Songs used during Passover,
Ruth used on Shavuot,
Lamentations used on the 9th of Av,
Ecclesiastes used during Sukkot,
Esther for the holiday of Purim.