Question

why do we celebrate diwali ?expain

Answer 1

This festival is celebrated in the Hindu month of Kartikamasam which falls sometime during October or November. It is celebrated to mark the return of Lord Rama from 14 years of Exile and his victory over the Demon Ravana. ... The Hindus worship the Lord Ganesha and Goddess Lakshmi during Diwali.
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Answer 2

Firstly I would like to tell that ,

Diwali is called the festival of light and it is celebrated to Honor Ramachandra the seventh avatar (incarnation of the God Vishnu) it is believed that, On this day Rama returned to his people after 14 yrs of exile during wbich he fought and one a battle against the demons and the demon king, Ravana.