Ganesh Chaturthi also known as Vinayaka Chaturthi is the Hindu festival of Ganesha

Ganesha

Ganesha , also spelled Ganesa or Ganesh, also known as Ganapati , Vinayaka , and Pillaiyar , is one of the deities best-known and most widely worshipped in the Hindu pantheon. His image is found throughout India and Nepal. Hindu sects worship him regardless of affiliations...

 also called Vinayagar in Tamil Nadu, the son of Shiva

Shiva

Shiva is a major Hindu deity, and is the destroyer god or transformer among the Trimurti, the Hindu Trinity of the primary aspects of the divine. God Shiva is a yogi who has notice of everything that happens in the world and is the main aspect of life. Yet one with great power lives a life of a...

 and Parvati

Parvati

Parvati is a Hindu goddess. Parvati is Shakti, the wife of Shiva and the gentle aspect of Mahadevi, the Great Goddess...

, who is believed to bestow his presence on earth for all his devotees in the duration of this festival. It is the day Shiva

Shiva

Shiva is a major Hindu deity, and is the destroyer god or transformer among the Trimurti, the Hindu Trinity of the primary aspects of the divine. God Shiva is a yogi who has notice of everything that happens in the world and is the main aspect of life. Yet one with great power lives a life of a...

 declared his son Ganesha

Ganesha

Ganesha , also spelled Ganesa or Ganesh, also known as Ganapati , Vinayaka , and Pillaiyar , is one of the deities best-known and most widely worshipped in the Hindu pantheon. His image is found throughout India and Nepal. Hindu sects worship him regardless of affiliations...

 as superior to all the gods. Ganesha is widely worshipped as the god of wisdom, prosperity and good fortune and traditionally invoked at the beginning of any new venture or at the start of travel.

The festival, also known as Ganeshotsav ("festival of Ganesha") is observed in the Hindu calendar

Hindu calendar

The hindu calendar used in ancient times has undergone many changes in the process of regionalization, and today there are several regional Indian calendars, as well as an Indian national calendar. Nepali calendar, Bengali calendar, Malayalam calendar, Tamil calendar, Telugu calendar, Kannada...

 month of Bhaadra

Bhaadra

Bhaadra or Bhadrapada is a month of the Hindu calendar. In India's national civil calendar , Bhaadra is the sixth month of the year, beginning on 23 August and ending on 22 September. Known as Purattaasi, it is the sixth month of the Tamil solar calendar...

pada, starting on the shukla chaturthi

Chaturthi

Chaturthi or Chaviti , is the fourth day of any lunar month in the Hindu calendar.-Festivals of Chaturthi:* Ganesh Chaturthi is one of prominent Chaturthi on which Lord Ganesha makes his presence on the earth....

 (fourth day of the waxing moon period).