Nine nights of Navratri are dedicated to nine powers of nine forms of Mata Durga
So, there are nine different pujas are performed on Navratri.

Navratri Day 1 - Ghatsthapana, Shailputri Puja
Navratri Day 2 - Dwitiya, Chandra Darshan, Brahmacharini Puja
Navratri Day 3 - Tritiya, Chandraghanta Puja
Navratri Day 4 - Chaturthi, Kushmanda Puja
Navratri Day 5 - Panchami, Skandamata Puja
Navratri Day 6 - Shashthi, Katyayani Puja
Navratri Day 7 - Saptami, Kalaratri Puja
Navratri Day 8 - Ashtami, Sri Durga Ashtami, Sandhi Puja
Navratri Day 9 - Navami, Ram Navmi, (Chaitra Navratri ends)