Actually, Dussehra is not celebrated for 10 days, it is Navratri which is celebrated for 10 days. Dussehra is celebrated on the tenth day of Navratri which is also called Vijaya Dashami.
The first nine days of Dussehra are dedicated to the worship of nine different forms of Goddess Durga, each embodying a unique manifestation of her power and shakti.
The tenth day of Dussehra marks the culmination of Navratri and is celebrated as the day of victory.
Each of the ten days of Dussehra is thought to represent a distinct stage in the spiritual development of humanity, serving as a microcosm of the human journey.
Just as Lord Rama and Goddess Durga had to overcome numerous obstacles before achieving victory, so too must individuals on the spiritual path confront and overcome their own inner demons.
CTA - Do you know that Dussehra Celebrated In Thailand