Dasha Hara in Sanskrit means eliminating ten bad qualities within you:
Ahankara (Ego)
Amanavta (Cruelty)
Anyaaya (Injustice)
Kama vasana (Lust)
Krodha (Anger)
Lobha (Greed)
Mada (Over Pride)
Matsara (Jealousy)
Moha (Attachment)
Swartha (Selfishness)
Hence, also known as 'Vijayadashami' signifying ”Vijaya” over these ten bad qualities.
Let the good triumph over the evil. Wish you all a very happy 'Dussehra'.