Navaratri is a festival dedicated to the worship of the Hindu deity Durga. The word Navaratri means 'nine nights' in Sanskrit, nava meaning nine and ratri meaning nights. During these nine nights and ten days, nine forms of Shakti/Devi are worshiped. The tenth day is commonly referred to as Vijayadashami or "Dussehra" (also spelled Dasara). Navaratri is an important major festival and is celebrated all over India.
Navaratri represents a celebration of the Goddess Amba .
Navaratri or Navadurga Parva happens to be the most auspicious and unique period of devotional sadhanas and worship of Shakti (the sublime, ultimate, absolute creative energy) of the Divine conceptualized as the Mother Goddess-Durga, whose worship dates back to prehistoric times before the dawn of the Vedic age.
A whole chapter in the tenth mandal of the Rigveda addresses the devotional sadhanas of Shakti. The "Devi Sukta" and "Isha Sukta" of the Rigveda and "Ratri Sukta" of the Samveda similarly sing paeans of praise of sadhanas of Shakti. In fact, before the beginning of the legendary war between the Pandavas and Kauravas in the Mahabharata – a foundational Sanskrit epic in the Hindu tradition – Lord Krishna worshipped Durga, the Goddess of Shakti, for the victory of the Pandvas.
Since the Vedic Age of the Rishies, the devotional practices recommended during Navaratri are primarily those of Gayatri Anushthana.
In the Vedic Age of the Indian Culture, the religious philosophy and devotional practices were focused towards true knowledge and ultimate realization of the supreme power of Gayatri (Bram Shakti). The Vedas were the basis of all streams of spirituality and science those days. Gayatri has been the source of the divine powers of the gods and non-goddesses in the heavens and their angelic manifestations and incarnations. Gayatri sadhana was also paramount in the higher level spiritual endeavors of the yogis and tapaswis. Gayatri Mantra was the core-focus of daily practice of sandhya-vandan (meditation and devotional worship) for everyone. As guided by the rishis, specific sadhanas and upasanas of the Gayatri Mantra were sincerely practiced during the festival period of Navaratri by every aspirant of spiritual enlightenment.

Navaratri is celebrated Four times a year. They are Vasanta Navaratri, Ashadha Navaratri, the Sharad Navaratri, and the Paush/Magha Navaratri. Of these, the Sharad Navaratri of the month of Puratashi and the Vasanta Navaratri of the Vasanta kala are the most important.Other two are observed only by shaktas only.
Vasanta Navaratri :-
Vasanta Navaratri, is nine days dedicated to the nine forms of Shakti (Mother Goddess) in the month of Chaitra (March–April) and is observed during the Shukla Paksha (waxing phase of moon) of Chaitra. The beginning of this Navaratri also marks the start of the new year as per the Hindu mythological lunar calendar (Vikrami Samvat).
Ashad Navaratri :-
Gupta Navaratri, also referred as Ashadha or Gayatri or Shakambhari Navaratri, is nine days dedicated to the nine forms of Shakti (Mother Goddess) in the month of Ashadha (June–July). Gupta Navaratri is observed during the Ashadha Shukla Paksha (waxing phase of moon).this is mostly observed by shaktas only
Sharad Navaratri :-
This is the most important of the Navaratris. It is simply called Maha Navaratri (the Great Navaratri) and is celebrated in the 'pratipada' (first day) of the bright fortnight of the lunar month of Ashvin. Also known as Sharad Navaratri, as it is celebrated during Sharad (beginning of winter, September–October).
Pausha/Magha Navaratri :-
Pausha Navaratri, also referred as Shakambari Navaratri, is eight days dedicated to the nine forms of Shakti (Mother Goddess) in the month of (December–January). Paush Navaratri is observed during the Pausha Shukla Paksha (waxing phase of moon). Shakambhari Purnima is the last day in the 8-day long holiday of Shakambari Navaratri.
Navaratri is celebrated in a large number of Indian communities. The mother goddess is said to appear in 9 forms, and each one is worshiped for a day. These nine forms signify various traits that the goddess influences us with. The Devi Mahatmya and other texts invoking the Goddess who vanquished demons are cited.
During the eight or ninth day, Kanya Puja, pre-pubescent girls are ceremonially worshipped.

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