Ma Siddhidatri the goddess worshipped on the 9th day of navratri which is also the last day of navratri also and the only goddess which is not the incarnation of Maa Parvati but later she became one of them. Know the reason by which you will get to know who Maa Siddhidatri is and why she worshiped in the nine goddess of navratri.
Lord Rudra worshiped Adi-Parashakti for the creation of the world in the beginning of the universe and it is believed that Adi-Parashakti had no form so the name adi-Parashakti was given. Now the information which is very important about Navratri 9th day MaaSiddhidatri is the supreme goddess of power, Adi-Parashakti appeared from the left half of Lord Shiva (rudra) in the form of siddhidatri.
Lord Shiva got the title of Ardh-Narishwar when goddess Siddhidatri appeared from his left half and It is also believed that Planet Ketu is governed by Maa Siddhidatri and provides him the direction and energy. Ma Siddhidatri is the creator of this world and always takes care of this world and helps her devotees in every problem.
The devotees who worship Ma Siddhidatri in the time of navratri gets all the benefits of Navratri 9th day Maa Siddhidatri because she is the only goddess who possesses and bestows all type of siddhis to her devotees. Even Lord Shiva also got all siddhis by the grace of this goddess only; this is also the reason why we called her siddhidatri. The meaning of this name is siddhi means power to complete any work (accomplishment) and datri means the giver (the one who gives something).
Not only human but Deva, Gandharva, Asura, Yaksha and Siddha also worship her but to worship her according to Navratri 9th day Maa Siddhidatri puja vidhi and at correct date, timeand mahurat is necessary.
The reason behind why she worshiped in the days of navratri is because she appeared from the left half of Lord Shiva in the form of Shakti so later she called the Shakti of shiva and became parvati or sati so in some or the other way all are one in the different form and with different reasons of incarnation.