Goddess Chamudeshwari sits magnificiently atop the  hill called Chamundi Betta which is a part of Mysore city landscape. Legend has it that Durga as Chamundeshwari vanquished the demon Mahishasura. The city that was called Mahishooru ( town of Mahisha) later became Mysore. Here she is worshipped as Mahishasura Mardhini.
She is the presiding diety of Mysore and the royal family.

Among the popular festivals celebrated in India, Navaratri is  the longest covering a ten day period. Navaratri celebration at Mysore is the most well-known all over the world.

Like the other festivals of India, Navaratri is rich in meaning. At one level, Navaratri signifies the progress of a spiritual aspirant. During this spiritual journey, the aspirant has to pass three stages personified by Durga, Lakshmi and Saraswati. Then, he or she enters into the realm of the infinite, wherein one realises one's Self. Navaratri, which literally means 'nine nights,' dedicates three days each to worshipping the Divine in the forms of Durga, Lakshmi and Saraswati. The tenth day though, is the most important; it is known as Vijayadashami, the 'tenth day of victory.'

The reason behind the worshipping of Durga, Lakshmi and Saraswati lies rooted in the philosophy that the attributeless absolute can only be known through the world of attributes—the journey is from the known to the unknown. Hence it is said that Shiva, who symbolises pure consciousness, can only be known through Shakti, who represents divine energy. That is why people worship Shakti, also known as Devi, in Her various manifestations.

Significance of Navaratri

The different stages of spiritual progress are reflected in the sequence of celebrations during Navaratri. During the first three days, Durga is worshipped. She personifies that aspect of shakti which destroys our negative tendencies. The process of trying to control our senses is akin to a war for the mind which resists all attempts at control. So the stories in the Puranas symbolically depict Devi in the form of Durga as waging war and destroying the asuras.

However, getting temporary relief from the clutches of vasanas does not guarantee permanent liberation from them. The seeds of the vasanas will remain within in latent form. Therefore, we should supplant them with positive qualities. The Bhagavad Gita refers to these qualities as daivi-sampat, literally "Divine wealth." Correspondingly, we worship Lakshmi during the next three days. Lakshmi is not just the giver of gross wealth or prosperity; She is the Mother who gives according to the needs of Her children.

Only the person endowed with daivi-sampat is fit to receive the knowledge of the Supreme. Accordingly, the last three days of Navaratri are dedicated to worshipping Saraswati, the embodiment of Knowledge. She is depicted as wearing a pure-white sari, which symbolises the illumination of the Supreme Truth. The tenth day is Vijaya Dashami, or the festival of victory, symbolising the moment when Truth dawns within. Also this day is celebrated to mark the victory of Durga over the demon Mahishasura

Thus, the significance of each stage of worship has clear parallels in the different stages of sadhana (spiritual practices): first, negative tendencies need to be controlled; second, virtues need to be ingrained; third, after gaining the necessary mental purity, spiritual knowledge needs to be acquired. Only then will the sadhak (spiritual aspirant) attain spiritual illumination. It is significant that Vijaya Dashami is considered auspicious for mantra initiation. Advanced spiritual aspirants are also initiated into Sanyaasa (vow of renunciation) on this day.

Significance of Navaratri for Householders

Navaratri is not only significant for spiritual aspirants,  it has a message for those who lead a worldly life as well. They should invoke Durga's help to surmount obstacles, pray to Lakshmi to bestow peace and prosperity, and contemplate upon Saraswati in order to gain knowledge. These three ingredients are just as necessary for a full and complete worldly life. In reality, when we pray like this, we are but invoking the Shakti that is within ourselves.

Durga, Lakshmi and Saraswati are not different entities, but different facets of the singular Divinity.

Some of the spiritual practices associated with Navaratri include fruit and milk fasts, japa (mantra chanting), chanting of hymns dedicated to Devi in Her different forms, prayer, meditation and recitation of sacred texts including the Devi Mahatmya, Sri Lalita Sahasranama and the Durga Saptashati.

Ayudha Puja

The ninth day is also the day of the Ayudha Puja. The Ayudha Puja is a worship of whatever implements one may use in one's livelihood. On the preceding evening, it is traditional to place these implements on an altar to the Divine. If one can make a conscious effort to see the divine in the tools and objects one uses each day, it will help one to see one's work as an offering to God. It will also help one to maintain constant remembrance of the divine. (In India it is customary for one to prostrate before the tools one will use before starting one's work each day as an expression of gratitude to God for helping one to fulfill one's duties.)

Children traditionally place their study books and writing implements on the altar. On this day, no work or study is done so that one might spend the day in contemplation of the Divine.

Vijaya Dashami

The tenth day is called Vijaya Dashami. Devotees perform a Saraswati Puja (ceremonial worship) to invoke the blessings of Saraswati. Some devotees also perform pujas dedicated to Durga to mark Her victory over the demon, Mahishasura.