The ninth day of Navratra is dedicated to goddess Siddhidatri form of Maa Durga. The siddhi that She provides is the realization that only She exists. She appears sitting on a lotus with four arms in which she holds a lotus, mace, discus and book. She is always in a blissful happy enchanting pose. She is surrounded by Siddhas, Gandharvas, Yakshas, Demons and Gods who are worshipping Her. She is the treasure house of mystic powers (tantra and mantra) and knowledge (gyan).
You should worship Her to activate your spiritual awareness and consciousness, offer devotional service to the Supreme, and to liberate your soul from karmic bindings. Worshipping Her is considered the most appropriate worship for acquiring the best religious assets.
The energies of Sri-Sri Sita and Ram manifest fully on the ninth day of Chaiti Navratri. This is the day for the celebration of Ram Navami which marks the victory of good over evil. The celebration helps spreading the Divine Grace of Ram in the material world.
नौवां नवरात्र सरल विधि - नौवां नवरात्रा:माता सिद्धिदात्री