India  is a land of Festivals and each of them have a great importance in  hindu culture. All these fasts and festivals are celebrated all over  India with great zeal and fervor. Among all the fasts and festivals,  Navratri fast holds a place of great importance. During the nine divine  nights of Navratri,  devotees worship the nine forms of goddess Durga.
The  festival of Durga Puja is celebrated twice in a year. The first  Navratri of the year lies in the month of Chaitra (March – April), known  as Chaitra Durga Puja and other in the Ashwin month (September –  October), known as Ashwin Masa Durga Pooja.
Observing Navratri fast for  nine days as per the rituals blesses the person with virtue and  hapiness. The details of the nine forms of Mata are given here:
Goddess Shailputri
Goddess  Shailputri is the first incarnation of goddess Durga and worshipped on  the first day of Navratri. Shailputri is the daughter of Himalaya seated  on a bull with trident in right hand and lotus in the left. On the  first day of Navratra, the devotee enters the cycle of foundation which  is a way to begin meditation and attain powers
Goddess Brahmacharini
Goddess  Brahmacharini is the second manifestation of Durga which represents  enlightening.  Brahma means “tapa” or penance and Charini means  observer, thus it is name of the one who observes penance. The goddess  is quiet and absorbed in meditation. She is a unique blend of radiance  and rigorous austerity that can be seen on her face which highlights all  the three worlds.
Goddess Chandraghanta
The  goddess Chandraghanta represents supreme knowledge and bliss with  radiant face which appear like an image of solar system. A bell shaped  mark of moon is present on her forehead because of which she is named  Chandraghanta. Her pacifying form clears all the sorrows and sadness of  her devotees. All the hindrances coming in way of a person are removed  by her blessings.
Goddess Kushmanda
Goddess  Kushmanda created the whole universe in the shape of an egg called  “Anda” with her little divine smile like a flower which bloomed with a  bud. Thus, she is known as Devi Kushmanda as she created the universe  with her little egg and gave light through her divine smile.  The core  of Sun is the residence of the goddess. She is the only one who controls  the functioning of Suryaloka.
Goddess Skandmata
The  fifth manifestation of the goddess Durga was named Skanda Mata because  she was the mother of lord Skanda. The goddess can be seen showering her  motherly blessings on her son Skanda Kumar. The goddess possesses four  arms and is seated on a lotus. Goddess Skandmata is the deity of the  solar system. By worshiping the goddess in the form of Skanda Mata, the  devotee gets all his desires fulfilled and tastes the supreme joy even  in this very mortal world.
Goddess Katyayani
The  fourth manifestation of Goddess Durga is worshipped in the form of  Goddess Katyayani. Goddess Katyayani gives instant results and her  devotees get freedom from all the troubles and sufferings in life. She  is known to kill the demons and sinners. The worship of Maa Durga as  Goddess Katyayani on 6th day of Navratri has a great significance. Yogis  & Sadhaks practice penance for Agya Chakra on this day. The person  worshipping the goddess can feel a strong sense of enlightenment in  himself.
Goddess Kalratri
Devi  Kalratri is the seventh manifestation of goddess Durga. She is  worshipped on the seventh day of Navratri. She is also known as  Shubhankari as she always give auspicious results to her devotees. Yogis  & sadhaks enters into the Shastra Chakra on this day
Goddess Mahagauri
Goddess  Mahagauri is the eighth manifestation of goddess Durga. Goddess  Mahagauri is worshipped on the eighth day of the Navratra.The goddess  protects the husband of those females who worship her with full  devotion. Unmarried girls get decent life partners by worshipping Devi  Mahagauri. The goddess blesses the gents who worship her with peaceful  life and burn all their sins. Goddess Mahagauri blesses her devotees  with peace and radiance in life.
Goddess Siddhidatri
Goddess  Siddhidatri is the ninth aspect of goddess Durga and hence, worshipped  on the ninth day of Navratri. Goddess Durga created this manifestation  to shower the sympathy and compassion on her devotees. Devas, sages and  humans everyone worship her will full devotion and she showers her  immense compassion on the devotee who worships her with pure heart.
Concluding Navratri Nine Divine Nights
On  the ninth day of the Navratra, Kanya Puja is performed according to the  rituals mentioned in the Shastras. 9 girls representing nine forms og  the goddess are worshipped on this day. A person can improve his fortune  by worshipping one girl child and salvation by worshipping two  girls  on this day. By worshipping 3 girls, one gets the devout mind and  wealth, treasure by worshipping 4 girls, wisdom and success by  worshipping 5 girls, six kind of achievements by worshipping 6 girls,  kingdom by worshipping 7 girls, wealth and prosperity by worshipping 8  girls and domination of earth by worshipping 9 girls. Girls up to 10  years of age are worshipped in Kanya Puja.
First  of all, the feet of the girls are washed with water and are made to sit  in a row on a pedestal. The girls are worshipped by chanting the  Mantras. Then, Kumkum is applied on the forehead of all the girls   followed by tying kaleva on their hands. Halwa, Puri and black grams  are served to them. Once the girls finish eating the prasad the devotee  touch their feet to get the blessings. Then give them some kind of  dakshina before departing them. Goddess Durga gets pleased when  the  devotee performs Kanya Pujan with proper rituals and gives him freedom  from all the troubles in his life.
Worshiping of Nine Forms of Mother
The  Navratra that begins on Ashwin Shukla Paksha Pratipada and continues  for nine days is called Sharda Navratra. The meaning of Nav is nine as  well as new. From Sharda Navrata onwards, season starts changing and the  days become smaller and colder. To avoid the effect of change of  season, there is a tradition of observing Navratra fast of nine days  since ancient times.
During  this period, the worshipper consumes plain food and meditate god. This  helps gain good health and virtue. These nine days are also called the  day of worshipping Shakti(Power).
There  is a tradition of observing Navratra twice a year. First Navratra is  from Pratipada of Chaitra month to Navami and the second is exactly  after six months in Pratipada of Ashwin Shukla Paksha to a day before  Vijayadashami. In the two Navratras Sharada Navratra is given more  importance.