Festival of Navratri (literally nine nights), also spelled Navaratri or Navarathri, is a significant nine-day Hindu festival celebrated in the autumn every year. There are four seasonal Navratri. Sharad Navratri is the most popular and significant of all four. That is why Sharad Navratri is also known as Maha Navratri. The festival, which marks the worship of Goddess Durga, begins today on September 21, 2017 with religious fervor and gaiety.