The Meaning of "Durga"
The word "Durga" in Sanskrit means a fort, or a place which is difficult to overrun. Another meaning of "Durga" is "Durgatinashini," which literally translates into "the one who eliminates sufferings." Thus, Hindus believe that goddess Durga protects her devotees from the evils of the world and at the same time removes their miseries.
The Many Forms of Durga
There are many incarnations of Durga: Kali, Bhagvati, Bhavani, Ambika, Lalita, Gauri, Kandalini, Java, Rajeswari, et al. Durga incarnated as the united power of all divine beings, who offered her the required physical attributes and weapons to kill the demon "Mahishasur". Her nine appellations are Skondamata, Kusumanda, Shailaputri, Kaalratri, Brahmacharini, Maha Gauri, Katyayani, Chandraghanta and Siddhidatri.
Durga's Many Arms
Durga is depicted as having eight or ten hands. These represent eight quadrants or ten directions in Hinduism. This suggests that she protects the devotees from all directions.
Durga's Three Eyes
Like Shiva, Mother Durga is also referred to as "Triyambake" meaning the three eyed Goddess. The left eye represents desire (the moon), the right eye represents action (the sun), and the central eye knowledge (fire).
Durga's Vehicle - the Lion
The lion represents power, will and determination. Mother Durga riding the lion symbolises her mastery over all these qualities. This suggests to the devotee that one has to possess all these qualities to get over the demon of ego.