Question: why navratri is celebrated for 9 days?
Answer: The festival is associated to the prominent battle that took place between Durga and demon Mahishasura and celebrates the victory of Good over Evil. These nine days are solely dedicated to Goddess Durga and her nine Avatars - the Navadurga. . Each day is associated to an incarnation of the goddess: Day 1 - Shailaputri.