Day two of the Navratri festival is dedicated to the second avatar of the goddess Durga. On this day, Devi Bramhacharini is worshiped all across the nation. Devi Brahmacharini is the unmarried form of Devi Parvati in which Brahma means penance and Charni signifies conduct. Brahmacharini together means one who conducts tenacity. She is the epitome of discipline, knowledge, dedication, and determination. In this form, she performed severe austerities or Tapa to obtain Lord Shiva as her husband. She holds Kamandalu in one hand and a rudraksha mala in the other.
In her previous birth, Devi Parvati was born as the daughter of Daksh Prajapati. She was married to Lord Shiva against the will of her father. This event sowed the seed of hatred toward shiva in Daksha's heart. To insult Shiva, Daksha organized a big yajna. He invited every Devta, yaksha, kinnara, Gandharva, and nagas to the yajna except Shiva and Sati.
Sati was furious and went to the yajna without the will of Shiva. Daksha insulted her for coming uninvited giving birth to the series of destructive events which ultimately led to the self immortalization of Devi Sati.
In her next birth, Sati was born as the daughter of shailraj but unaware of her goal of her. One day Narada visited the home of Himalaya and told the Parvati about Shiva. Narada also guided her with the guru mantra and asked her to go on penance.
Parvati did severe austerities for over 3000 years, without any of her royal luxuries. She walked barefoot along with her two friends and did very long austerities in harsh conductions. Due to her Tapa, she got Bhagwan Shiva as her husband. This avatar of her was came to be known as Bramhcharini.