Dashain or Bada'dashain, also referred as Bijaya Dashami in Sanskrit, is a major Hindu religious festival in Nepal. It is also celebrated by Hindus of Nepal and elsewhere in the world, including among the Lhotshampa of Bhutan and the Burmese Gurkhas of Myanmar. The festival is also referred as Nauratha, derived from the Sanskrit word for the same festival Navaratri which translates to Nine Nights. A version of this festival is celebrated as Navaratri, Dussehra or Dashera by Hindus in India, although rites and rituals vary significantly.
It is the longest and the most auspicious festival in the Bikram Sambat and Nepal Sambat annual calendars, celebrated by Nepali Hindus, along with their diaspora throughout the globe. In Nepal, it is also known as the biggest festival in the country and is the longest national/public holiday, 5 days to be exact. It is the most anticipated festival in Nepal. People return from all parts of the world, as well as different parts of the country, to celebrate together. All government offices, educational institutions, and other offices remain closed during the festival period. The festival falls in September or October, starting from the shukla paksha (bright lunar night) of the month of Ashwin and ending on Purnima, the full moon. Among the fifteen days on which it is celebrated, the most celebrated days are the first, seventh, eighth, ninth, tenth, eleventh, and fifteenth.
Dashain is the main festival of Hindus in Nepal.
The word Vaḍādaśain̐ (वडादशैँ) is a Nepali sandhi, where "baḍā" (बडा) means "important" and "daśa͠i" (दशैं) means "tenth", implying the most-significant final day of the festival of Durga Puja, celebrating the dawn after the end of Nauratha (nine nights). The word Dashain is ultimately derived from the Sanskrit word daśamī, denoting the 10th day of the Kaula (month) in this context.
For followers of Shaktism, it represents the victory of the goddess Durga. In Hindu scripture, the demon Mahishasura had created terror in the Deva-lok (the world where gods lives) but Durga killed the devils also known as demons.