It's the start of Diwali, the festival of light
13 November 2012 Last updated at 17:43 GMT
It's the start of Diwali, a five day festival of light, celebrated by Hindus, Sikhs and Jains.
It's a celebration that includes, lights, sweets and wearing new clothes.
Leah has been to Leicester, where there is a large Indian population, to find out more.