The brightest festival is incomplete without the twinkling of thousands of oil lamps, lanterns and firecrackers. Historically, Diwali signifies the return of the Lord Rama to Ayodhya after spending 14 years in exile and defeating the evil Ravana.
To welcome their beloved prince, the people of the kingdom lit a row of oil lamps outside their homes. Till this day, oil lamps are lit to signify the victory of virtue over evil.
They are also lit to dispel the darkness, as Diwali is celebrated on Amavasya, the new moon day. Lighting a lamp also encourages us to do away with the darkness of ignorance and always accept the light of knowledge.