The last day or the ninth day is known as Navami.
People pray and worship Goddess Siddhidhatri on the ninth day of the Navratri.
Goddess Siddhidatri is another form of Goddess Parvati, the wife of Lord Shiva.
Goddess Siddhidhatri is also the “Ardhanarishvara” form of Shiva and Shakti. It is believed that on one side is the body of Lord Shiva and on the other side is that of Goddess Siddhidatri. Therefore, she is also worshipped by the name “Ardhanarishwara”.
Goddess Siddhidhatri is depicted sitting on a lotus. She is believed to possess and bestows all types of Siddhis or powers. Here she has four hands. According to Vedic scriptures, Lord Shiva gained all the siddhis or powers by worshipping Goddess Siddhidatri. She is also known as Mahalakshmi.