According to our Indian sacred scripture, there are 40 navaratris for the welfare of the human beings,
But four Navratris are the main Which are celebrated in period from the Shula Paksh Tithi’s to the navami tithi’s in the months of Chaitra, Ashada, Aswin and Magh. They can be observe as the symbol of our four major efforts: Dharma, Arth(economy), Kaam (Wishes) and Moksha (Salvation)
Among these we merge the four into TWO. By merging Arth into Dharma and Kaam into Jigyasa (Curiosity) for Moksha, then there remains only the two Navaratris as the symbols of major efforts of life.