Navaratri is an annual Hindu festival observed in the honour of the goddess Durga also referred to as Adi Parashakti. It spans over nine nights (and ten days), first in the month of Chaitra (March/April of the Gregorian calendar), and again in the month of Ashwin (September–October). It is observed for different reasons and celebrated differently in various parts of the Hindu Indian cultural sphere. Theoretically, there are four seasonal Navaratri. However, in practice, it is the post-monsoon autumn festival called Sharada Navaratri.
The word Navaratri means "nine nights" in Sanskrit, nava meaning "nine" and ratri meaning "nights."
In the eastern and northeastern states of India, the Durga Puja is synonymous with Navaratri, wherein goddess Durga battles and emerges victorious over the buffalo demon Mahishasura to help restore dharma. In southern states, the victory of Durga or Kali is celebrated. In the western state of Gujarat, Navaratri celebrations are constituted by arti, followed by garba. In all cases, the common theme is the battle and victory of good over evil based on a regionally famous epic or legend such as the Devi Mahatmya.
Celebrations include worshipping nine goddesses during nine days, stage decorations, recital of the legend, enacting of the story, and chanting of the scriptures of Hinduism. The nine days are also a major crop season cultural event, such as competitive design and staging of pandals, a family visit to these pandals, and the public celebration of classical and folk dances of Hindu culture. Hindu devotees often celebrate Navaratri by fasting. On the final day, called Vijayadashami, the statues are either immersed in a water body such as a river or ocean, or the statue symbolising the evil is burnt with fireworks, marking the destruction of evil. During this time preparations also take place for Deepavali (the festival of lights) which is celebrated twenty days after Vijayadashami.
According to some Hindu texts such as the Shakta and Vaishnava Puranas, Navaratri theoretically falls twice or four times in a year.