The auspicious day marks the victory of Lord Ram over demon-king Ravana thereby symbolising the victory of light over darkness, good over bad, enlightenment over ignorance, so on and so forth.
To remind humanity that good is invincible and that evil will cease to exist, people across India celebrate this festival with great devotion.
Mammoth effigies of Ravana are burnt to celebrate the defeat of the demon king at the hands of Lord Ram.
Te day also marks the victory of Goddess Durga over Mahishasur.
Vijaya Dashami also means the triumph over of the ten varied vices that flourish in humans. Only when we overcome our shortcomings, we emerge victorious and the ultimate goal is to attain truth and achieve the absolute.
A very happy Dasha-Hara to all of you.