Deepavali is a festival celebrated by all Hindus globally which is also known as the Festival of Lights since there will be many colorful lights lit on that day. Aside from that, maybe it is called the Festival of Light that indicates the triumph of light, the good over the evil.
There is an interesting legend regarding the triumph of good over evil. Long time ago in the kingdom of Pradyoshapuram, there lived a demon called Narakasura who rule the land with fear. A lot of the people suffered hardship and life is terribly bad and harsh. Then come Lord Krishna who destroy the demon and the day Narakasura died becomes celebrated as Deepavali, the Festival of Light where the good triumph over evil.
Today is Deepavali. BenardCometh Revelations wishes all readers of Hindu faith a very happy Deepavali. May the light be with you always.
Again, Petronas make great advertisements during festivals like this. Here's Deepavali 2008 Petronas Advertisement.
Petronas Deepavali 2008 Advertisement