Goddess Durga Devi is worshiped in nine avatars. During these nine holy days, each day of goddess Durga Mata is worshiped in different avatara.
First day of Navratri – Kalasha Sthapana (Kalasha Pooja) or Ghata Sthapana –
Shailaputri Puja
Second day of Navratri – Preeti Dwitiya – Brahmacharini Puja
Third day of Navaratri – Chandrakanta pooja or Chandraghanta puja
Fourth day of Navaratri – Kushmanda puja
Fifth day of Navratri – Skandamata Puja – Lalitha Panchami
Sixth day of Navratri – Katyayani Puja – Maha Shashti or Durga Shashti
Seventh day of Navratri – Kaalratri Pooja – Durga Saptami or Maha Sapthami
Eighth day of Navaratri – Maha Gauri Pooja – (Durgashtami Puja/Maha Ashtami/Veerashtami)
Ninth day of Navaratri – Siddhidatri Puja – (Mahanavami/Maharnavami or Durga Navami)
Tenth day of Navratri – Aparajitha Puja or Shami Pooja – Vijaya Dashami or Dasara