First day
The first day of Navratri Pooja is devoted to Shailputri. Goddess Shailputri is daughter of Himalayas. She is a form of Mata Shakti (Goddess of Power) and spouse of Lord Shiva.
Second day
On the second day of Navratri Goddess Brahmacharini is worshipped in homes and temples. The word 'Brahmcharini' is derivative of the word Brahma, which stands for Tapa (Penance). This form of mata Shakti is close to Uma or Parvati.
Third day
Goddess Chandraghanta is worshipped on the third day of Navratri. She is considered to be Goddess of beauty and bravery.
Fourth day
The form of Mata Shakti which is worshipped fourth day of Navratri is Kushmanda. As per Hindu mythology, it is considered that the Goddess Kushmanda has originated this entire Universe by her laugh.
Fifth day
Devotees worship Skand Mata on the fifth day of Navratri. Skanda is chief warrior of God's army and Goddess is mother of Skanda that is why the Goddess is called Skand Mata.
Sixth day
Sixth day of Navratri is intended for Devi Katyayani. In her typical image, the goddess Katyayani seated on lion and has tree eyes and four legs.
Seventh day
On the seventh day of Navratri festival, devotees worship and adore the Goddess Kalratri. As name indicates Devi Kalratri is as black as a dark night and she is notorious to eliminate fear from her devotee's heart.
Eighth day
Maha Gauri is the form of Mother Durga which is worshipped on eighth day of Navratri. The Goddess Maha Gauri signifies calmness and endorses wisdom. As name suggest, she is considered enormously beautiful. Her color is like snow and adorned with white colored jewelries.
Ninth day
Ninth form of the Goddess Durga, Siddhidatri is worshiped on the ninth day of Navratri. She is Goddess of all eight siddhis and is worshipped by all Yogis, Sadhakas, Siddhas and RIshis-Munis.